In 17th century England, the Doctor and itinerant thespian Richard Mace uncover a plot by a crew of criminal Terileptils to wipe out humanity.

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Main Cast: Peter Davison, Matthew Waterhouse, Sarah Sutton, Janet Fielding, Michael Robbins, Michael Melia, Peter van Dissel, James Charlton, Neil West, Eric Dodson

Director: Peter Moffatt

Writer: Eric Saward

Editors: Rod Waldron, Ken Bilton

Cinematographer:

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