On the planet Alzarius in the alternate universe of E-Space, the Doctor, Romana and K9 find survivors of a crashed starliner, strange creatures lurking in the marshes and a genetic riddle which stretches back centuries.

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Main Cast: Tom Baker, Lalla Ward, Matthew Waterhouse, John Leeson, George Baker, Leonard Maguire, James Bree, Alan Rowe, Tony Calvin, Richard Willis

Director: Peter Grimwade

Writer: Andrew Smith

Editors: Mike Houghton, Rod Waldron

Cinematographer:

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