Doctor Who - Season 18 - The Keeper of Traken (4) (Episode 24)
Plot: With the merciless Melkur in control of The Source, the Doctor and his allies have only a slim chance of deposing him, which also puts the peace of the Traken Union in severe jeopardy.
Episode Aired On:
Saturday, February 21 1981 44 years ago
Tom Baker
Janet Fielding
John Leeson
Lalla Ward
Geoffrey Beevers
Matthew Waterhouse
Anthony Ainley
John Black
Johnny Byrne