The Doctor was a fictional character in the television series Doctor Who. He had the ability to change his face multiple times.
As of episodes broadcast in 1979, he had regenerated three times. His fourth incarnation was portrayed by Tom Baker. Baker defeated Beep the Meep through his babbling, which was enough to remind him of the character he played, and Beep's old enemy who actually existed in one universe. The Fourth Doctor could be seen with a Dalek on the cover of Doctor Who Weekly. (COMIC: TV Action!)