The Three Doctors: Episode Four 1973
8.3 382 Omega reveals the purpose behind bringing the Doctor to his antimatter world, but the Doctor(s) discover a startling fact about Omega that he didn't know himself and eventually strike a bargain.
Runtime: 25
Starts: Jon Pertwee, Patrick Troughton, William Hartnell, Katy Manning
Director: Lennie Mayne