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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.
Length 100 minutes
George Baker | Lalla Ward | Tom Baker | Leonard Maguire | James Bree | Tony Calvin | Norman Bacon | Richard Willis | John Leeson | Alan Rowe | June Page | Andrew Forbes | Matthew Waterhouse | Bernard Padden | Adrian Gibbs | Barney Lawrence