In a Mars base, the inhabitants are being infected by a mysterious water creature which takes over its victims. The Doctor is thrust into the middle of this catastrophe, knowing a larger one is waiting around the corner.

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Main Cast: David Tennant, Lindsay Duncan, Peter O'Brien, Sharon Duncan-Brewster, Gemma Chan, Aleksandar Mikic, Michael Goldsmith, Cosima Shaw, Joplin Sibtain, Alan Ruscoe

Director: Graeme Harper

Writers: Phil Ford, Russell T Davies

Editor: William Oswald

Cinematographer: Ernest Vincze

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