Time itself is in peril! The Time Lords and UNIT find themselves besieged by a mythic figure from the Time Lords' past hell-bent on destruction. The only way to defeat him is to break the First Law of Time and let the Doctor help himself — literally...

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Main Cast: Jon Pertwee, Patrick Troughton, William Hartnell, Katy Manning, Nicholas Courtney, John Levene, Stephen Thorne, Rex Robinson, Roy Purcell, Laurie Webb

Director: Lennie Mayne

Writers: Dave Martin, Bob Baker

Editor: Jim Walker

Cinematographer:

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