William Hartnell was the Who that started it all. By giving this mysterious alien being very human qualities, he was able to capture the imagination and the hearts of children and adults alike. Sometimes unpredictable, sometimes cranky, but always loveable, William Hartnell set the stage for all the Doctors who followed. And certainly his masterful portrayal of this strange new character contributed much to the original success.

Playing the Doctor after his first generation, Patrick Troughton faced the greatest challenge of his career. How could he retain the appeal of the first Doctor while still adding his own special charm? His Chaplinesque twist on the original character was a smashing hit. This Doctor needed no weapons or superhuman strength. All he needed was his unfailing resourcefulness, magical wit and lightning-quick mind. No matter what enemies he encountered, he was always at least ten steps ahed of them.

Jon Pertwee

When the High Council of Time Lords decided to exhile the Doctor to a primitive planet called Earth, he underwent his second regeneration. Jon Pertwee became the new Doctor. Younger, taller and classier than the Doctors before him, he still continued the same sense of fun. But armed with neat gadgets and surrounded by beautiful companions, this Bond-like Doctor had a sense of daring that earned the series a 73% increase in adult viewers.

Tom Baker

With his halo of curls and braod smile, Tom Baker looked like a fugitive from the Marx Brothers. Dressed in a frock coat, floppy hat and the 17-foot long scarf that became his trademark, he became, more than any before him, the embodiment of Doctor Who. Maybe that's why he played the part for seven years, longer than anyone else. And although the character he played was 750 years old, Tom imbued him with a child-like curiosity that captured the hearts of viewers everywhere.

Peter Davison

Peter Davison became the youngest regeneration to date and the only actor to have grown up watching the series. He was twelve when it premiered, and it became an avid fan for the next six years. To him, taking on the role of Doctor Who carried with it a special responsibility - being a role model for young people. That's why he recaptured the vulnerable qualities of some of the earlier Doctors, showing that the Doctor wasn't invincible and could be defeated.

Colin Baker

As the sixth Doctor, Colin Baker has been through some pretty tough times. He was put on trial by the Time Lords of Gallifrey, charged with interfering in galactic affairs. If found guilty, his sentence will be death and the loss of all remaining regenerations. During the trial, the past, present and future of the incomparable Doctor Who is reviewed, and his ultimate fate is in Conlin Baker's hands!

Sylvester McCoy

After 25 years of intergalactic adventures - the longest-running science fiction series ever - Doctor Who regenerates himself once more. Sylvester McCoy brings his own special brand of whimsical humor to this most sought after role. This time he finds himself back in London, 1963 - where his adventures began - to deal with unfinished business involving his old adversaries, the Daleks.