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.
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.
David Tennant ,Lindsay Duncan ,Peter O'Brien
Ernest Vincze
BBC Cymru Wales ,
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as The Doctor
as Captain Adelaide Brooke
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