Despite protestations against being the Evil One, mounting evidence points to the Doctor's prior involvement with Leela's people, and an error in judgment he once made in their distant past that puts them all in immediate jeopardy.

Starring:

Elisabeth Sladen, Frazer Hines, Jacqueline Hill, John Levene, John Scott Martin, Jon Pertwee, Katy Manning, Nicholas Courtney, Pat Gorman, Patrick Troughton, Peter Davison, Tom Baker, William Hartnell, William Russell

Genre:

Adventure, Drama, Sci-Fi