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.

Cast:Tom Baker, Lalla Ward, Matthew Waterhouse, John Leeson, George Baker, Leonard Maguire,

Genre:Science Fiction, Adventure, TV Movie,

country:United Kingdom,

Production:BBC,