EPISODE DESCRIPTIONS (4a-4z & 5a-5v)

SERIES 4a-4z | 5a-5v

(4a-4z)

(4a) ROBOT - Almost dead, the Doctor regenerates himself and his outward appearance changes (hence the change from Jon Pertwee to Tom Baker). Brigadier Lethbridge Stewart hands him over to the care of a naval doctor attached to UNIT, Harry Sullivan. The Brigadier himself has a new problem: important weapon plans and equipment are vanishing from government establishments. Sarah Jane Smith visit a scientific research center where she discovers that work has been done on an advanced type of robot. A group of unscrupulous scientists is using the machine in their plot to blackmail the world into accepting their demands. The robot itself is impregnable, and regenerates by absorbing energy. Designed by its creator to serve humanity, it is re-programmed to kill, but because this instruction conflicts with its prime directive, it becomes a very mixed-up machine. The Doctor foils the scientists' attempt at blackmail - but they have managed to seize computer control of the world's atomic weapons. But then the robot takes over and a blast from a disintegrator gun has only the effect of making it grow to gigantic size. Then, using the formula invented by the robot's creator, the Doctor manages to constitute a metal destroying virus. Rapidly the robot shrinks to dust.

(4b) THE SONTARAN EXPERIMENT -After defeating the Wirrn, the Doctor is ready to return to Earth, but there appears to be a fault in the transmat system. They land on a planet and the Doctor goes down with Harry and Sarah to put the equipment in correct working order. The travellers find, to their surprise, that there are other visitors on the planet. There is the crew of a spaceship from another Earth colony. And there is Field Major Styre, a Sontaran. Styre is making a report on the planet as preliminary to an invasion. This in turn will precede a take-over of the galaxy. His report includes brutal experiments to assess the potential of resistance and he captures Sarah. The Doctor challenges Styre to physical combat to enable Harry to remove the terrulian diode bypass transformer from the Sontaran ship. When Styre attempts to re-power, he finds himself drained of energy. Earth is safe for resettlement by the human race.

(4c) THE ARK IN SPACE At a time in the far distant future, Earth has been rendered uninhabitable by solar flames. As a result, a cross-section of the population has been carefully selected and placed in a fully automated space station where, deep frozen, they will wait for the day when they can return to the planet. Thousands of years later, the Doctor arrives with Sarah and Harry in the TARDIS to find that for some reason, long past the date when they should have revived, the inhabitants are still in a state of suspension. The station has been invaded by giant wasp-like creatures, the Wirrn, who intend to absorb the humans, both body and mind. The Doctor defeats the Wirrn so that the now awakening humans can return to begin life once more on earth.

(4d) REVENGE OF THE CYBERMEN - The Doctor, with Sarah and Harry, returns to Nerva, the Ark in Space, to find that the Tardis has drifted back a few thousand years in time. Plague is raging through the space station, which is manned only by a handful of frightened survivors. Sarah fall victim to the mystery virus. The Doctor discovers that the Cybermen are responsible; the 'plague' is in fact not a disease but a poison carried by the rat-like mechanical Cybermats. Gold is deadly to them and so they want to destroy every scrap of the metal in the universe as a prelude to taking over the galaxy. They are helped by the quisling Kellman, who is playing a devious game in league with Vorus, the leader of the Guardians on the planet Voga. There are very extensive mines on Voga, and the Cybermen have selected it as their first target. For this they need Nerva. Contact is made with the Vogans and their leader Tyrum, and eventually the Doctor manages to defeat the Cybermen and save the planet.

(4e) GENESIS OF THE DALEKS - The Time Lords send the Doctor, Sarah and Harry to the planet Skaro at a time when the war between Thals and Kaleds is reaching its final stage. The Doctor's mission is to prevent the birth of the dreaded Daleks who evolved out of this war. Hunted by both sides in a war-torn world, the Doctor eventually becomes the prisoner of Davros, the brilliant crippled Kaled scientist. Davros has invented a travel machine to house the creature into which the Kaleds, genetically crippled by centuries of warfare, will eventually mutate. But Davros is obsessed by his own creation and is giving it destructive powers and a ruthless intelligence which were not part of the original design. These travel machines are destined to become the Daleks! The Doctor helps to lead a revolt of Kaled scientists, horrified by what Davros is doing. But Davros, in his determination to preserve the Daleks, helps the Thals to destroy his own people with a super-missile. Then he uses the Daleks, now fully operational, first to wipe out the Thal City, then to destroy those remaining Kaleds who oppose him. Some Thals survive. The Doctor manages to entomb Davros in the fortified bunker which has become his final refuge. Here the Daleks turn on Davros, destroying their creator. The Doctor refuses to destroy the Daleks when he has the chance on the grounds that it would be genocide; he says that even from the Daleks a greater good will eventually emerge. Whisked away from Skaro by the Time Lords, the travellers disappear.

(4f) TERROR OF THE ZYGONS - Accompanied by Sarah and Harry, the Doctor arrives in the TARDIS in response to an urgent S.O.S. call from the Brigadier. They land in Scotland to find an investigation concerning the mysterious disappearance of oil rigs in the North Sea. Center of the attacks is the village of Tulloch, very close to Loch Ness. The Doctor discovers that this is the work of an alien race - the Zygons - who live in the depths of Lock Ness and whose almost invincible weapon is a huge monster, actually a Skarasen, which is half-animal, half-machine. The Zygons' crippled spaceship has been resting on the bottom of the Loch for centuries. Unable to return to their home planet due to its destruction, the Zygons plan to take over Earth and turn it into a new home planet for their race. Able to change form and take on a human physical appearance, the Zygons have infiltrated the village. The Doctor exposes the Zygons and frees their captives, including the local Duke. The Brigadier blows up the Zygon ship, but Broton, the leader, has managed to get to London and is now threatening to destroy a World Energy Conference. Once again, the Doctor prevails and the Skarasen survives to swim happily back to Loch Ness.

(4g) PYRAMIDS OF MARS - The Doctor and Sarah are returning to UNIT headquarters in the TARDIS when the ship is suddenly caught up by a mysterious force and is thrown violently about. Sarah sees the materialization of a terrifying form which then vanishes. The TARDIS makes a normal touchdown and they find that they have indeed landed on the site of UNIT, but it is in the year 1911 and what is standing there is a large private house called the Priory. It belongs to Professor Marcus Scarman who has been in Egypt exploring ancient tombs. While there, he penetrated the pyramid prison of Sutekh-Set - the God of Darkness of mythology who has taken control of him. In a time/space tunnel, the professor is sent back to England to work to bring about the release of Sutekh - the bringer of "the gift of death to all mankind." In order to do this, the Pyramids of Mars must be destroyed in order to terminate the Eye of Horus, the key to Sutekh's imprisonment. The world - the Doctor tells Sarah - is now facing the greatest danger it has ever known as Scarman and his robot mummies build a rocket that will destroy the Eye of Horus on Mars and so releases his master. But, by using all his ingenuity, the Doctor is able to bring about the destruction of Sutekh.

(4h) PLANET OF EVIL - Doctor Who and Sarah are on their way back from Loch Ness to London in the TARDIS when they receive a Mayday call. They find themselves on Zeta Minor - a planet on the outer-most edge of the known universe. At a time far into the future, a geological expedition from the planet of Morestra, looking for alternative sources of energy, has run into trouble. Only the leader, Professor Sorenson, is still alive. The Doctor and Sarah are suspected of causing the deaths and they are taken prisoners aboard the Morestran space probe. The probe is attacked by anti-matter forces and only the Doctor has the knowledge to deal with the situation. The enemy is dispelled - for the moment - and the rescue ship prepares to take off. However, due to Sorenson's ambition to make scientific discovery of all ages, the anti-matter monster is also aboard and begins to attack, taking a hideous toll on the crew. The Doctor endures one of the most terrifying adventures of his career before he is able to drive the forces that threaten to destroy them, back to Zeta Minor.

(4j) THE ANDROID INVASION - When the TARDIS lands on Earth, Sarah recognizes Devesham, a village she knows well and is delighted to see again. But Devesham has changed and so has the nearby Space Defense Station. Old friends are hostile and the apparent leader of the community is an astronaut thought to have died years before. Then the TARDIS takes off on its own accord - leaving the space travellers behind. The Doctor soon realizes that they are not on Earth at all; they are caught in a rehearsal of a master plan to invade the planet. The Kraals want to abandon their dying world and colonize a new one - first wiping out the indigent population. The Doctor and Sarah must return to Earth to give a warning, but how can this be done without any means of transport? To complicate matters further, a duplicate Doctor and a duplicate Sarah appear on the screen. After a dangerous journey through time and space in two small containers, the Doctor and Sarah arrive just in time to turn the table on the Kraals and defeat the invasion.

(4k) THE BRAIN OF MORBIUS - The duo arrive on a desolate planet in the middle of a graveyard of crashed spaceships. Before long, they find their way to a ruined stronghold where they are welcomed by Professor Solon and his one-armed servant, Condo; they are apparently the sole inhabitants of Karn. The Professor is most hospitable, but the Doctor soon realizes why the Time Lords have directed him to this strange place. The only other living beings on Karn are the members of the Sisterhood who guard an eternal flame which produces the elixir of life. Morbius, once a Time Lord and the greatest criminal mind in the galaxy is also on Karn - just his brain survives after he was sentenced to death and his body dispersed. The Professor is creating a body for him - only the head is lacking and the Doctor's seems ideal for the purpose. Both the Doctor and Sarah fight against the deadly perils, until, with the help of the Sisterhood, they bring about the destruction of Morbius and his allies.

(4l) THE SEEDS OF DOOM - Deep in the permafrost of the Antarctic, scientists discover two vegetable pods. The Doctor identifies them as Krynoids, an alien species of plant, hostile to all animal life - humans are animals. When Doctor Who is consulted in London, he flies out at once to investigate these pods further; he is aware of the danger. He and Sarah are soon joined by two agents of Harrison Chase, an eccentric multi-millionaire who collects rare botanical species in the way some men amass art treasures. One of the pods opens and a Krynoid takes over a scientist's body. However, the monster is destroyed before it can achieve its full horrific potential. The other pod is hi-jacked by Chase's men and taken back to England. In England, the second Krynoid overtakes Chase's scientist, Keeler, and quickly evolves into a giant, sinister Krynoid monster which threatens to turn the native plants of Earth against humanity. The Doctor and his allies in UNIT and the World Ecology Bureau devise a strategy to stop the demented millionaire. They manage to infiltrate Chase's residence, but it is too late to stop him - or the Krynoid. The RAF bombs the Krynoid, now larger than Chase's house, before the monster germinates.

(4m) THE MASQUE OF MANDRAGORA - Doctor Who's first journey into Earth's history for a long time is a tale of swordplay, galloping horsemen, strange sorcery, and evil intrigue set against a Renaissance background. As the story opens, the Doctor reveals some of the mysteries surrounding the interior of his Time and Space machine, the TARDIS; after 13 years, he has developed a new control room. He is so preoccupied that he fails to notice that he is heading into the Mandragora Helix, an extra-terrestrial energy force which appears as a ball of fire and takes over human beings. The force enters the ship and compels it to land in Renaissance Italy. The Doctor and Sarah become involved in the intrigues of a noble family in which a wicked uncle is seeking to usurp the dukedom of his nephew, aided by a secret sect led by his astronomer, Hieronymous. The Mandragora force links up with this underground religious cult - the Brethren of Demnos - and through them attempts to enslave humankind. The Doctor and Sarah fight to prevent the devilish plan, but although they have allies, the brutal Count Frederico and the sinister Hieronymous make their task more than usually perilous. At the climax of the story, during a masked ball, the Brethren make a sudden horrifying appearance. But the Doctor ultimately saves Earth from Demnos and from the mysterious force of Mandragora.

(4n) THE HAND OF FEAR - The Doctor and Sarah return from Renaissance Italy to find themselves involved in a rock-clearing explosion. A hand - which must have been living in the quarry for some 150 million years - is found in Sarah's hand after she is rescued from the rubble. Although apparently semi-fossilized, it soon shows that it possesses very strange powers and has a life of its own. Sarah, due to her physical contact with the hand, becomes enslaved by it and in a trance she carries it to the nearest nuclear reactor. Soon it is utilizing atomic power to regenerate itself in the form of a beautiful girl, Eldrad, who once was sentenced to obliteration on her home planet of Kastria. The Doctor, believing Eldrad's story that she was a victim of an alien power, takes her back to the desolate arctic wilderness that her native planet is now. There, with Sarah, he faces many perils - including an Eldrad transformed into giant masculine form and bent on galactic domination - before he manages to escape back to earth. The story ends as the Doctor receives an urgent summons to return to Gallifrey - his own planet. He can't take Sarah with him who has becomes disenchanted with space travel anyhow. They say goodbye and he leaves to face more dangers in his next adventure.

(4p) THE DEADLY ASSASSIN - Gallifrey - world of the Time Lords and birthplace of Doctor Who - is the setting of the latest adventure. Here is a world of elaborate ceremony combined with sophisticated technology. The Master returns. Now past his twelfth regeneration - usually accepted to be the last - he is determined not to die and he has concocted a devilish scheme to achieve his purpose. He is now a skeletal figure in a death-like mask and he manipulates his puppets from a hiding place deep in the vaults of Gallifrey's Capitol. The Doctor has received a summons to return to his own planet and on the journey he has a vision of the assassination of the President of the Time Lords. When he arrives at his destination, he tries to avert the murder, but instead he finds that he himself is the prime suspect. Setting out to establish his innocence, the Doctor discovers that his arch enemy, the Master, is behind the plot. In one brilliant manoeuver, the renegade Time Lord intends to bring about the vaporization of the Doctor and the total destruction of Gallifrey. After a deadly battle within a hallucinatory dreamscape, the Doctor defeats the Master's champion, Chancellor Goth and robs his old enemy of victory - at least for the time being. But the Master survives to continue his struggle for galactic omnipotence at some time in the future.

(4q) THE FACE OF EVIL - (The Doctor now has a new companion, Leela, a primitive savage whom he has to discourage from carrying - and using - a crossbow; she still has her knife and is inclined to stab first, and ask questions later. However, she is quick to learn and although she has more or less forced her way on board the TARDIS, the Doctor soon finds her a very useful aide.) The story begins as the Doctor arrives on a new planet and befriends a girl, Leela, who has been turned out of her tribal village for daring to question the ways of their God Xoanon. He soon discovers that the Sevateem are the descendants of a survey team of a space ship sent out to explore the planet. Their enemies - The Tesh - have as ancestors the technicians who remained on board the ship. The space ship itself, where the Tesh live, is concealed behind a time barrier and on board is Xoanan - the giant computer that controls everything on the planet, including strange invisible monsters in the jungle. The Doctor is puzzled when the native refer to him as "The Evil One." He is even more puzzled when he discovers a giant head that is obviously modelled on his own. He then begins to remember. He came to this planet once before to rectify an error in the computer. What he failed to recognize was that the machine was suffering from birth pangs, not death throes. It was evolving into an entirely new form of life and now Xoanon is suffering from schizophrenia - it contains within itself its own personality and that of the Doctor who failed to erase his imprint when he rectified the controls. Now the Doctor has to penetrate the Tower of Xoanon and deal with a machine gone mad - with a madnes that is causing death and destruction to all those who look upon it as a god. His way lies through a space ship turned into an instrument of destruction by a malevolent personality that looks and sound like the Doctor himself.

(4r) THE ROBOTS OF DEATH - The Doctor and Leela land in the TARDIS inside a giant mobile sand-miner on a distant planet; a piece of equipment run entirely by robots except for a very small group of human beings in command. As they land, there is a series of unexplainable murders, and at once suspicion falls upon the duo. As the Doctor attempts to solve the mystery, the sand-miner is sabotaged and the robots, programmed never to harm humans, begin to turn against them. In a last desperate gamble, the Doctor tracks down a mad scientist - disguised as one of the crew - who has identified with the robots and is determined to make them rule the world. He is killed by one of the automata he has adapted to his own ends and a take-over by the robots is averted. As the remaining members of the crew wait for a rescue ship, the Doctor and Leela depart in the TARDIS for another adventure.

(4s) THE TALONS OF WENG-CHIANG - Doctor Who arrives in London with Leela and almost at once finds himself involved in a macabre murder mystery. He soon establishes that the Tong of the Black Scorpion is responsible for wave of terror that is sweeping the city as one girl after another disappears. Events center around the Palace Theatre where the brilliant Chinese illustrator, Li H'sen Chang, is topping the bill supported by his dummy Mr. Sin. With the help of Leela and two new friends - the manager of the Palace, Mr. Jago, and Professor Litefoot, a pathologist - the Doctor investigates further. The trail leads him through London's sewers where he encounters a 10 foot rat, to a limehouse opium den and then to the House of the Dragon. Here, in the Tong headquarters, the Doctor solves the mystery and battles for his life against Magnus Greel, a warped war criminal from the 51st century who is regarded by his followers as the incarnation of the ancient Chinese god, Weng-Chiang.

(4t) THE INVISIBLE ENEMY - A shuttle craft carrying a relief crew to Titan (one of the moons of Saturn) is enveloped by a virus swarm from outer space which brings the men under its spell. When they arrive on Titan, they kill the crew already there and attack the supervisor who somehow manages to send a distress signal. Doctor Who and Leela answer the distress call, but on their way they too are attacked. Leela is rejected; the nucleus of the swarm penetrates the Doctor's brain. Leela takes him for treatment to a medical center in the asteroid belt where he is put in the care of Professor Marius who possesses a dog-like walking computer - K9. The Doctor and Leela are cloned, minitaurized and then injected into the Doctor's spinal column to track down and destroy the nucleus. But it escapes and by reversing the miniaturization process, it becomes part of the macro-world before it moves to Titan to hatch its eggs. The Doctor pursues it there and destroys the swarm by releasing methane gas and oxygen into the satellite's atmosphere, turning it into a vast fireball. Back at the medical center, Professor Marius, who is shortly to return to Earth, asks the Doctor if he would like to keep K9. Leela is delighted by the idea; the Doctor is less enthusiastic. But K9 makes the final decision by walking into the TARDIS.

(4v) HORROR OF FANG ROCK - This adventure finds the TARDIS still in England around the turn of the century. The Doctor intends to show Leela around Brighton, but when they emerge from the time machine, in dense fog, they find themselves on Fang Rock - a remote lighthouse station. The light has failed and the Doctor finds one of the keepers dead in the generator room, apparently electrocuted. The survivors of a shipwreck arrive, but the lighthouse is no haven as further sinister deaths occur until only the Doctor and Leela are left alive. Barricaded in the lamp room, the duo face the ultimate final onslaught of a Rutan intelligence scout who, in human disguise, has been using the lighthouse tower as an aerial to transmit information to a battle fleet in deep space. In the end, the Doctor and Leela defeat the Rutan and save earth from possible destruction in a conflict between two mighty space powers.

(4w) THE SUNMAKERS - The TARDIS lands on Pluto where the Doctor is surprised to find a colony of humans living there under the light of several artificial suns. The time-travellers prevent Cordo from committing suicide because of his inability to pay the heavy and unjust taxes requested by the Company, the entity which made the suns around Pluto. Cordo flees the arrival of the Gatherer and leads the Doctor and Leela to the underground city where they meet members of a resistance movement. To convince its hostile leader, Mandrel, that he is not a spy, the Doctor attempts to defraud a bank, but is captured by the Gatherer, who releases him and places under surveillance. Joining forces with the rebels, the Doctor leads them to capture the PCM production complex where a gas is manufactured and released into the atmosphere to keep the citizens under control. Leela is captured and condemned to be steamed alive, but the Doctor is able to save her. When the PCM gas no longer affects them, the citizens rebel and kill the Gatherer. The Doctor confronts the Collector for the Company and learns that he is a member of the Usurian race. Unable to deal with the inflation that the Doctor had introduced into his computer, the Usurian shrinks back to its original form and is bottled by the Doctor.

(4x) IMAGE OF FENDAHL - The Doctor and Leela land on a present day Earth to see who is using a sonic time scan machine - a highly dangerous procedure. They land near an old priory in a supposedly haunted wood and discover that a rich scientist is running experiments on a 12 million year old human skull - 8 million years earlier than any other record of human beings existing on Earth. When the scientist's assistant tries to take over the operation for his own ends, the situation becomes critical, threatening not only those concerned, but also the whole of humankind. What no one except the Doctor realizes, is that the skull is in fact the receptacle for the Fendahl, a creature which lives on death, absorbing the life forces from anyone around it. It takes over one of the Scientist's helpers and begins to breed. If it is not stopped, it will destroy all human life on Earth, as it has done on other planets. The Doctor's efforts seem doomed to fail, until with the help of an old woman known for her powers in the "old religion" of the countryside, he discovers an ancient and very simple weapon against the Fendahl.

(4y) UNDERWORLD - The Doctor and Leela encounter a group of astronauts from a planet which blew up over 100,000 years ago. The astronauts are looking for another spacecraft which left just before them, but disappeared while still containing colonists and the race's gene bank to start a new life in another part of the cosmos. The craft, with the Doctor, Leela and K9 now on board, plunges out of control into a strange planet on the edge of creation. It looks as though they are all doomed. But the planet is not exactly what it seems. It is, in fact, a planet which has formed around the missing space ship. The descendants of the original colonists still live inside it, serving the "Oracle" - the computer, which housed and protected the gene bank cylinders, which has grown and developed until it is now master of all around it, ruthlessly controlling all life within the planet. Over the years, the original purpose of both the ship and the computer have been forgotten and the arrival of the astronauts and the Doctor spark a violent conflict in which they must battle against the Oracle and its servants before they take possession of the precious cylinders and the astronauts can blast off again, with their descendants, to create a new life on their chosen planet.

(4z) THE INVASION OF TIME - The Doctor returns to his own planet, Gallifrey, to claim his position as President. Despite opposition from the Chancellor and others, he is inducted and then connected to the Matrix, which is the sum total of the Time Lord knowledge and experience, and the obligation and duty of the President. Then, to everyone's horror, he turns traitor by collaborating with a force of strange invaders who travel along transmitted wave beans and appear only as balls of light. When all seems lost, we discover that the Doctor is only collaborating with the invaders in order to gain their confidence. There is no way he can get rid of them until he has persuaded them that it is safe for them to materialize. Only then will he be able to discover how they got into Gallifrey and where they came from. He eventually discovers that they are Vardans, creature from a distant Quasar. But, before he can do anything, they realize that they are being tricked and attack him. The day is saved by Leela and her friends mounting an attack on the now defenseless citadel and with the help of the Chancellor, K9 and the TARDIS itself, the Doctor is able to send the invaders back to their home planet. However, even as they are celebrating their victory, a new enemy appears - one of the Doctor's old adversaries: the Sontarans, a race that lives only for war. In fact, the Vardans were only being used by the Sontarans to penetrate Galifrey's defenses for them. The Sontarans are trying to gain the secret of time itself, at present known only to the Time Lords, so that they can gain mastery over all things at all time. The battle finally enters the TARDIS as the Doctor is pursued through its deepest recesses, trying to gain time while K9 and a young Time Lord follow his instructions to make the forbidden ultimate weapon with which he can destroy the invaders.

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(5a-5v)

(5a) THE RIBOS OPERATION - The White Guardian of Time gives the Doctor the task of finding and collecting the six segments of the Key to Time. These are hidden in different parts of the universe, disguised in other shapes and forms. To help him in his quest, the Guardian allocates an assistant, newly graduated female Time Lord, Romanadvoratrelunder (Romana for short). She has a tracer device whichwill locate each segment and transmute it into its proper form. The first segment is on Ribos, a planet where the inhabitants have reached aMiddle Ages stage of development. The item for which they are searching is in the form of a large nugget of a rare and valuable mineral called Jethrick. Unfortunately, the nugget is being used by a confidence trickster from Earth who is trying to sell the planet to the exiled prince of a warlike race. When the prince becomes suspicious of the con man, the Doctor, Romana and K9 find themselves in danger. They are hunted through Ribos' underground catacombs - inhabited by savage beasts - by the prince and his men. Only by using the beasts, K9 and all his wits, is the Doctor able to escape and retrieve the vital segment.

(5b) THE PIRATE PLANET - The Doctor and his companions are now searching for the second segment of the Key to Time, and they are heading for a planet called Calufrax. After a mysterious disturbance almost destroys the TARDIS, they discover another planet, Zanak, where Calufrax should be. Zanak's people seem to live a life of luxury and ease, but they are sternly ruled by a strange character known as the Captain. Their riches appear mysteriously, following frequent announcements of new golden ages of prosperity. The people live in fear of the Mentiads, telepathic creatures who seem to be impervious to the weapons of the Captain's guards, and who appear at the beginning of each new golden age to seize a young man or woman. While the Doctor is vainly trying to prevent one man from being taken away from them, Romana is arrested and finds herself on the Captain's bridge; his control center. There she encounters a terrifying figure - half man, half machine - presiding over an amazing array of complex technology. It seems that the Captain's machinery has broken down, and to save her life, Romana must try to repair it. She is helped by the Doctor, who has come to rescue her. K9 is left to track down the Mentiads. They quickly discover that the machinery is in fact a set of huge engines which enable the entire planet to de-materialize, jump through space, and re-materialize around another planet. The minerals and energy resources of the victim planet are extracted by automatic mining machinery to provide fuel for the Captain's vile purposes. Calufrax is now inside Zanak - and the next target is Earth. To release the people of Zanak from their pampered slavery, to save Earth, and at the same time to find the second segment, the Doctor and Romana must foil the Captain's plans and destroy his transmat engines. But to do this means braving the Captain's guards. The Doctor organizes an attack on the bridge, but is captured by the true master of Zanak, Queen Xanxia, who has been using the pillage energies to keep her original body alive. The Doctor and the Mentiads try to stop the planet's next jump through the space vortex, which would take Zanak to Earth. During the fighting the Captain attempts to revolt and is killed by Queen Xanxia. Cut off from her much needed power source, she is shot by a rebel. The Doctor soon discovers that Calufrax, now reduced to a football-sized husk, is the second segment of the Key to Time.

(5c) THE STONES OF BLOOD - The third segment to the Key to Time seems to be on present-day Earth. The tracer leads the Doctor and Romana to an ancient stone circle which has a strange history, and where blood sacrifices are still carried out. The signal from the tracer comes and goes inexplicably, and it is soon apparent that things are not what they seem to be. Leaving Romana to keep an eye on the stone circle - and on Professor Emelia Rumford and her friend Vivien Fay, who are doing a survey of it - the Doctor goes to visit a pseudo-droid nearby. There he discovers the worship of an ancient Celtic goddess, Cailleach, connected with the stones. In the meantime, Romana finds herself in danger from someone she thinks is the Doctor. Before long, trouble erupts, The stones, actually creatures called Ogri, begin walking the area, bringing death and destruction, while sinister black crows keep an evil watch over everything, acting as the eyes of the goddess. But who is she? The doctor searches for and finds her. In a hyperspace vessel, trapped in another dimension above the circle, is an escaped criminal from another world, actually Vivien Fay, who has taken refuge there for the past 4000 years, protected by the segment of the Key - her necklace. Vivian is really Cessair of Diplos, and she was sent in the spacecraft with a group of justice machines, the Megara. In trying to obtain the key and return the criminal to her captors, the Doctor and Romana find themselves trapped in the perpetual limbo of hyperspace and condemned to death by the Megara justice machines. Only K9 can help, but he is on Earth with his only means of reaching the vessel smashed and useless. But the Doctor tricks the Megara into probing Vivien/Cessair who in turn change her form into that of a stone megalith allowing the Doctor to use her necklace, the third segment, to banish the Megara and to return them to the TARDIS.

(5d) THE ANDROIDS OF TARA - The Doctor knows the planet Tara to be a peaceful and pleasant place. So, having collected three of the segments of the Key to Time, he decides to take a rest and allow Romana to find the fourth on her own. But the planet is not as peaceful as it appears. Romana is rescued from a wild animal by a charming man who introduces himself as Count Grendel - only to find herself imprisoned in his castle and about to be "dismantled" as an android. The Doctor also finds himself involved with androids when he is taken prisoner by another group of Tarans led by Prince Reynart. The Prince is to be crowned the next day, but Count Grendel, it seems, will stop at nothing to claim the crown. To thwart any move, the Prince has an android copy of himself which he intends to use to divert Grendel, but it is broken and they need the Doctor to repair it. Soon the Doctor and Romana find themselves completely embroiled in plots and counter-plots involving not only the Prince and Count, but also the beautiful Princess Strella (who happens to be able to pass as Romana's double) and it also imprisoned in Grendel's castle. When the Count captures the real Prince, leaving the Doctor and his friends with only a badly damaged android copy, the situation looks hopeless. It takes all the Doctor's considerable ingenuity, with a little help from K9 and great deal of remarkably expert swordsmanship, to prevent disaster for all concerned.

(5e) THE POWER OF KROLL - The fifth segment of the Key to Time is hidden somewhere on the third moon of Delta Magna. This place consists for the most part of marsh and swamp, so K9 has to stay behind in the TARDIS. The Doctor and Romana leave the ship, but soon find themselves in trouble. They are caught in the middle of a feud between the Swampies and a group of technicians. The Swampies have been given this particular moon as a kind of reservation, and they resent the intrusion of the technicians who have set up pilot plant to collect methane gas from the marsh and convert it into protein. It is then shipped back by rocket to their home planet. Romana is captured by the Swampies and the Doctor by the technicians. Each of the protagonists is very suspicious of the newcomers, and before long, Romana if being offered as a sacrifice to Kroll, the Swampies' god - a giant squid-like creature who is supposed to live in the waters. At first the Doctor and Romana try to dismiss Kroll as merely a legend created by superstition, but they soon discover that he is terrifyingly real - a savage monster nearly two miles across and hundreds of feet high. Hunted by both the Swampies and the technicians, the Doctor and Romana need every scrap of ingenuity to defeat Kroll, which they must do to find the fifth segment and to save their lives. The Doctor finds that Kroll's large size was caused by his swallowing of a holy relic of the Swampies, which is the fifth segment.

(5f) THE ARMAGEDDON FACTOR - The final stage of their search for the segments of the Key to Time takes the Doctor and Romana to the twin planets of Atrios and Zeos. They find a full-scale interplanetary nuclear war raging. Atrios is off its orbit, and Zeos seems to have disappeared altogether. They land on Atrios and soon become involved in the war - and with the mysterious marshal in command of the Atrian forces who is intent on pursuing hostilities to their ultimate conclusion. But it soon becomes apparent that the Marshal is being controlled from somewhere else. The Doctor suspects that he and Romana have been lured into a trap, and that the Black Guardian may well be responsible for what is happening on Atrios. The final segment of the Key seems to have some connection with the Atrian royal princess, Astra. But she has been kidnapped by Zeons and taken to their planet. Doctor Who, with Romana and K9, go in search of her and find themselves trapped on Zeos. The Marshal is on his way to press home his final assault. The master computer of Zeos is programmed to destroy itself, the planet, and everything around it, if he does so. In a desperate attempt to avoid this ultimate catastrophe, the Doctor manages to rig a temporary time loop around the Marshal and the computer. He then goes in search of the Shadow, the agent of the Black Guardian who is controlling the situation from an artificial third planet. But it looks as if the Doctor and his friends are completely within the Shadow's power, and that the entire key to Time will be his. Yet help comes from an unexpected quarter when the Doctor discovers another renegade Time Lord on the Shadow's planet. Together - and with a little help from K9 - they manage to save the day.

(5g) CREATURE FROM THE PIT - In answer to a distress signal, the Doctor, Romana and K9 land on Chloris - an abundantly fertile planet on which metal has become a highly valuable commodity. They fall into the hands of the Lady Adrasta whose power is derived from her monopoly on the planet's metal. She polices her subjects with carnivorous tumbleweeds ("wolfweeds") in the control of her Huntsman. All those who displease her are thrown into the Pit - a worked out mine - where they are to be consumed by a terrifying creature. The Doctor enters the Pit and befriends Organon - an astrologer of sorts and the only one to have survived the creature. The Doctor comes face to face with the creature and discovers that it is, in fact, a trading ambassador called Erato who had come to Chloris to suggest a mutually beneficial trading agreement - exchanging metal for chlorophyll. Because Adrasta stood to lose her power by such a deal, she deprived Erato of his communication device and lured him into the Pit. Unfortunately, a distress signal from Erato's spacecraft triggered a neutron star from his home planet, programmed to collide with Chloris' sun. With Erato's help, the Doctor deflects the star from its course and helps set up a trading agreement between the two planets.. Adrasta is killed by Erato and Chloris is left in the enlightened care of Adrasta's former henchman, the Huntsman.

(5h) CITY OF DEATH - What begins as a holiday in Paris (1979) for the Doctor and Romana develops into something more sinister when they meet Duggan, an English detective, and become involved in an alien plot to steal that most famous of art treasures, the Mona Lisa. The plot is masterminded by the Count and Countess Scarlioni. The Count is really an alien call Scaroth who was splintered in time when his Jagaroth spaceship exploded on take-off from prehistoric Earth. Consequently, he exists in 12 different Earth times. Using this it his advantage, he has conducted massive art frauds to finance experiments with a time travel machine, which he hopes will take him back to the point where he can prevent the explosions of his spaceship. In a room which has been sealed for centuries in the Count's cellar, the doctor discovers six apparently genuine Mona Lisas. The TARDIS takes him to Renaissance Italy where he hopes to talk the matter over with his old friend Leonardo da Vinci. But Leonardo is not there and the Doctor meets the evil Captain Tancredi - another manifestation of Scaroth - who is forcing da Vinci to paint more Mona Lisas. Back in Paris - under the threat of the city's destruction - Romana is forced to help Count Scarlioni. He travels back to pre-historic times, hotly pursued by the Doctor, who has realized that the explosion of the Jagaroth spaceship was the blast of radiation which triggered the development of life on Earth. Thanks to Doctor Who, Scaroth's plan is foiled and the course of history remains unaltered.

(5j) DESTINY OF THE DALEKS - This latest adventure in space and time takes the Doctor and Romana to a desolate planet, which transpires to be Skaro, home of the Doctor's oldest and deadliest enemy - the Daleks. Here they meet a new and seemingly friendly race of aliens - the Movellans, recently arrived in a huge spaceship. The Movellans and the Daleks have been at war for centuries. Now their battle fleet computers have reached a logical stalemate and each side is looking for an advantage. The Daleks have returned to Skaro to retrieve their evil creator, Davros, who could help them win the war. The Movellans, who are in fact a robot race, intend to use the Doctor for much the same purpose. But the Doctor acts first by finding and kidnapping Davros. The Movellans attempt to destroy Davros, and with his the entire planet, by setting fire to the atmosphere. Fortunately their attempt fails and, with the Doctor's help, a party of the Daleks' slave workers overcome the Movellans. Then the Daleks mount a "kamikaze" mission against the Movellan ship, perishing in the attempt. Davros is sent to Earth to stand trial as a war criminal and the Doctor explains to Romana how the battle computer stalemate could have been resolved by either side switching off their computers causing confusion for their opponents.

(5k) NIGHTMARE OF EDEN - A space collision triggers off a sinister chain of events which involved the Doctor, Romana, and K9 in a drug smuggling racket. In the course of his investigations, the Doctor has to contend with hordes of revolting mud-formed jungle monsters call Mandrels, and Zip, the most dangerous addictive drug in the Universe. After a crash in space, two spacecrafts are locked together. On is a naturalist, Tryst and his woman assistant, Della, who have with them a continuous Event Transmuter, a machine which allows whole areas of land to be removed from planets and stored on laser crystals, along with the local fauna. This is apparently part of a conservation exercise. As a result of the crash, the machine becomes unstable, releasing hordes of Mandrels into the passenger ship. At the same time, the Doctor discovers that some unknown person is smuggling Zip on board with the result that the Doctor himself becomes the prime suspect of the local customs men. With the help of an undercover narcotics agent, the Doctor manages to prove his innocence by discovering that the Mandrels themselves are the source of the drug. By putting then on to a crystal recording, Tryst had discovered the perfect smuggling ploy and was in the process of beaming the crystal recording to the pilot on the other ship when the crash upset his plans. The Doctor, with the help of Romana and K9, manages to fight off the Mandrels, separate the ships and capture the smugglers.

(5l) HORNS OF NIMON - The Nimon, a terrifying figure not unlike the Minotaur - a huge man with a bull's head - dominates this chilling Doctor Who adventure. It begins with the Doctor losing both Romana and the TARDIS. However, in his efforts to regain them he becomes involved in a bizarre world of human sacrifices and evil power complexes. While the TARDIS is immobilized for repairs, it falls into a gravity whirlpool along with a damaged ship taking a group of young men and women to the planet Skonnos as sacrifices for the Nimon. The Nimon has promised the Skonnons a might military empire if they will first build a labyrinthine complex for him and bring him sacrifices. The Doctor repairs the Skonnon ship, but gets left behind in his defunct TARDIS by the treacherous co-pilot who flies on to Skonnos taking Romana with him. But when a giant asteroid hits the TARDIS, the Doctor escapes from the gravity whirlpool, lands on Skonnos and penetrates the complex just in time to save Romana and the sacrifices. He discovers that the Nimon complex is power generator which is causing the gravity whirlpool in space and thereby building a Black Hole through which the rest of the Nimon race will travel to Skonnos and take it over. Romana accidentally gets sent through the Black Hole to Crinoth, the last planet the Nimons settled on. She discovers they too were fooled by the Nimons into building a complex and were then wiped out when millions more Nimons arrived like a plague of locusts. Romana return to Skonnos armed with this knowledge which the Doctor then uses to defeat the Nimons.

(5n) THE LEISURE HIVE - Doctor Who and Romana cut short an unsatisfactory holiday in the English seaside resort of Brighton to visit the Leisure Hive on Argolis - an artificial environment created on a planet laid waste by war. Here travelers and businessmen of the 23rd century can relax in style. Rendered sterile by the war, the Argolins are a dying race and the Hive seems to be dying alongside then as rival planets offer more modern attractions. When the Doctor and Romana arrive, a grisly accident occurs in the Tachyon Recreation Generator, the showpiece of the Hive. Apparently there is a connection between this event and the Argolins' deadly enemy, the Foamasi who have offered to buy the planet. Brock, and agent from Earth, tried to persuade the Argolin leader, Mena, to sell. However, her son doesn't agree with the deal. Mena is rapidly aging and Hardin, an earth scientist, and his assistant, Stimson, claim their development of tachyonics will make rejuvenation possible. Mena's son, Pangol, uncovers Stimson as a fraud after he dies mysteriously, apparently at the hands of the Foamasi who have gained access to the Hive. The Doctor and Romana are arrested for murder, but Hardin helps them escape. Pangol announces a coup d'etat and begins to alter the Recreation Generator in an attempt to clone himself and create a powerful army against the Foamasi. But the Doctor has cannibalized the TARDIS' Randomizer to implement Hardin's rejuvenation theory with the result that a hall full of troops fade away shortly after their creation. Pangol and his mother fall into the machine - and emerge as a youthful Mena and a small bawling baby.

(5p) STATE OF DECAY - Imprisoned in the isolated universe of E-space, Doctor Who and Romana land on a strange planet ruled by King Zargo and his Queen Camilla who live in barbaric luxury in their Tower, holding the starving peasants in awe. The spirit of scientific inquiry has been officially suppressed, but hidden in the hills are a team of rebels led by the technologically-inclined Kalmar. They have set up headquarters inside a dump of rusting scientific equipment of mysterious origin. The Doctor and Romana are captured by the rebels, but manage to persuade them as fellow-scientists that they should be allowed to investigate the Tower. The King and Queen receive them with superficial cordiality. The atmosphere soon disintegrates when the Doctor mentions the contents of a 1,000 year old ship's log he found at the Rebels' headquarters. The proceedings are interrupted by the Royal Councilor Aukon, giving the Doctor and Romana a chance to explore. Meanwhile, Adric, a stowaway on the TARDIS, is caught attempting to steal a loaf of bread from the community Hal of the Village and falls into the clutches of Aukon, who has come to make his selection of youths. The Doctor and Romana have discovered that the Tower is in fact the lost Explorer craft which left Earth 1,000 years ago and was diverted into E-space. The Scout Ships which form the three turrets are the only parts in remote working order. They also discover that the King and Queen, along with their Councilor were the original officers of the ship. Further investigation reveals the ghastly truth - a vat of blood and the drained bodies of the village youths give a clue to the King and Queen's evil hold over the community - Zargo, Camilla, and Aukon are vampires and their master, the Great Vampire, lies in the ground beneath the Tower - ready to arise. The Doctor persuades Kalmar to lead his rebels and the villagers in a concerted attack on the Tower. Using one of the Scout Ships to skewer the Vampire through the heart, the Doctor is able to dispose of the sinister threat forever.

(5q) MEGLOS - For years the inhabitants of the planet Tigella have relied on the Dodecahedron - a mysterious source of energy - to feed their underground city. When the power becomes unstable, threatening their civilization, their wise leader Zastor sends for his old acquaintance, Doctor Who. Meanwhile a gang of space raiders, the Gaztaks led by General Grugger, have been commissioned to capture an earthling and bring him to the long dead planet Zolfa-Thura. Inside a gleaming laboratory that rises up from beneath a desert landscape is Meglos - the last survivor of Zolfa-Thura. He has been preserved in a form of a cactus, but now he can occupy the body of the earthling and become mobile. He invites the mercenaries to join him on the greatest mission the galaxy has ever known - the invasion of Tigella and the capture of the Dodecahedron. Meglos has managed to mold his new humanoid appearance into a form identical to the Doctor and easily persuades Zastor to leave him alone in the Power Room. When the real Doctor arrives, he is mistaken for the man who stole the Dodecahedron. In the resulting confusion Meglos, manages to get away and the Doctor is taken to the Power Room. Romana arrives at the city after investigating the surface and unwittingly helps Meglos to escape. She and Caris, a girl who tried to take Meglos to the Guards, rush to the Power Room to explain the situation where they find the Doctor spread-eagled and the sacrificial slab about to be crushed to death by the ritual rock. The Doctor leads them to Zolfa-Thura as Meglos is about to release the almost infinite power of the Dodecahedron. The tables are turned and Zolfa-Thura vanishes in a flash of light. The Tigellans return to tame the surface of their planet and start anew - no longer dependent of the Dodecahedron.

(5r) FULL CIRCLE - Doctor Who and Romana's attempted return to their home planet Gallifrey is frustrating when their TARDIS is diverted to a planet called Alzarius. Here they meet the community from the giant passenger starship Starliner which crashed 40 centuries ago, now threatened by "mistfall" when periodically the planet is enshrouded in fog and creatures rise up from the marshes to wreak havoc. The Outlers, a group of young people who have dissociated themselves from the community, believe the story of "mistfall" to be a myth perpetuated by the Deciders in order to retain power over the Starliners. But the myth becomes fact as the Marshcreatures rampage over the planet under the cover of fog. The Outlers take refuge in the TARDIS holding Romana at knife point. The Starliners existence revolves around the preparation for the ship's departure, but the Doctor discovers it is an empty ritual of blind obedience to a vast library of manuals - none of the Starliners actually knows how to pilot the craft. Meanwhile, the Marshcreatures have taken over the TARDIS and are transporting it to the Outlers cave. Romana is attacked by Marshspiders and falls into a coma. Adric, one of the Outlers, inadvertently dematerializes the TARDIS and leave Romana stranded. She is rescued by the Doctor and taken back to the Starliner. When she revives, she has undergone a personality change and now behaves like the raging Marshcreatures. With the help of the Outlers, the Doctor discovers the Starliners are not visitors to the planet, but evolved Marshcreatures wiped out the original crew and passengers countless generations ago and have ritually maintained the craft ever since. The Doctor gives them the vital instructions needed to fly the craft and leaves them to decide whether to remain on Alzarius or to follow their destiny as evolving intelligences. As the TARDIS dematerializes with Adric stowed away unnoticed by the Doctor and Romana, the scanner shows the Starliner taking off.

(5s) WARRIORS' GATE - The TARDIS is hijacked by Biroc, a time-sensitive Tharil, who has just escaped from the privateer ship of Captain Rorvik. Biroc steers the TARDIS into an eerie white void and leaves. The Doctor follows him to find a mirror-like gateway guarded by ax-wielding robots, the Gundans. Romana falls prisoner of Rorvik, who arrives at the gateway just as the Doctor manages to pass through to the other side of the mirror. There, the Time Lord finds Biroc and learns that the Tharils, once ruler of a vast empire and notorious slave-owners, were defeated by the Gundans, which were made by their rebellious slaves. The Tharils are now kept prisoner in the impervious dwarf star alloy hold of Rorvik's ship. Meanwhile, on the other side of the gateway, Romana has been freed by another Tharil, Lazlo. Rorvik is now determined to blast his way out of the void. The back-blast of the ship is reflected by the mirrors, shatters the hull and releases the Tharils. They return to E-space with Romana and K9 while the Doctor and Adric are blown back into N-space.

(5t) THE KEEPER OF TRAKEN - The Union of Traken is famous as a place of universal harmony, held together by the Keeper, Guardian of the bio-electronic "Source" which forms the organizing power of the Empire. So benign is the atmosphere of the place that it literally calcifies visiting evil creatures into the form of statues. Such a being is known on Traken as "Melkur", and one of these stands even now in the Grove of the Keeper's Sanctum, tended by the fervently u[right Consul Kassia. But all is not well on Traken. The current Keeper's millennium is about to come to an end, and the Union will shortly enter a period of great trial. This is the urgent news the keeper conveys to Adric and the Doctor when he invites their help. Consul Kassia marries Consul Tremas, the chief scientist of the Traken Union, and the man who - Kassia learns to her secret distress - the Keeper has chosen as his successor. She confides to the Melkur statue that she is shortly to lose her husband to the power of the Source (and is frightened and astonished to hear Melkur reply, seeming to promise help). Melkur seizes upon Kassia's plight to arrange for Kassia's husband, along with the Doctor and Adric, to be imprisoned on false charges. As Melkur become the new Keeper of Traken, he reveals himself to be the Master! (The statue of Melkur is in reality the Master's TARDIS.) Thanks to an almost catastrophic diversion, during which Adric and Nyssa, Tremas's daughter, nearly succeed in destroying the Source, the Doctor manages to defeat his old enemy. In a last minute twist, the Master seizes upon Tremas's body to effect his thirteenth regeneration.

(5v) LOGOPOLIS - Tegan gets a puncture in her car tire on her way to her first flight as an air stewardess. She seeks help from the Police Box on the verge nearby - but actually it's the TARDIS, inside of which the Doctor and Adric are investigating the Police Box that they have materialized around in order to take measurements of it for their trip to Logopolis, the city of Logic, which is inhabited entirely of mathematicians. The Doctor is venturing there because his friend Monitor, leader of the Logopolitans, has devised a way to create solid objects out of numbers and they can also help the Doctor repair his chameleon circuits in the TARDIS. While Tegan loses her way inside the TARDIS, the Police are inspecting her car, and the Doctor and Adric keep circling through a gravity bubble from one police box TARDIS to another until the Doctor ventures outside the original TARDIS. There he runs into the Police who suspect him of the crime and show him what they have found: the body of her Aunt Vanessa in the back seat - shrunk to the size of a doll - on of the Master's calling cards. With Adric's help as a diversion, the Doctor eludes the police and heads back to the TARDIS to continue his planned trip. However, a mysterious figure (actually the Watcher, the Doctor's new self-to-be) has been glimpsed all day long in the distance and eventually gives the Doctor some very important news about the future. When Adric later questions him about the encounter, the Doctor can only enigmatically warn the boy that some enormous trial lies ahead. At the moment of arrival at Logopolis, a frightened Tegan emerges from the TARDIS interior. The three of them are taken to the Main Logic Room at the Central Register, which Monitor admits to being modeled around the famous Pharos computer room at Cambridge, for Logopolis maths can make a copy of any object through time and space. Which is why the Master follows the Doctor and his companions to Logopolis - but he has a few tricks up his sleeve and since he has stolen Tremas's body, he uses Nyssa to try and defeat the Doctor and to become the ruler of the universe. But there is one problem, the Master hasn't taken into consideration that if the Logopolitans stop their computations, then the whole universe, which has been temporarily stabilized by Logopolitan created voids, will deteriorate. Against his better judgment, the Doctor joins forces with the Master to save the universe, but is double crossed when the Master announces his plan to make slaves out of the human race, or let them die if they refuse his offer. The Doctor saves the day by disconnecting the Master's necessary cable, but falls to his death where the Watcher then regenerated into the next carnation of Doctor Who.