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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Character: The Doctor
Character: Captain Adelaide Brooke
Character: Ed Gold
Character: Maggie Cain
Character: Mia Bennett
Character: Yuri Kerenski
Character: Roman Groom
Character: Steffi Ehrlich
Character: Tarak Ital
Character: Andy Stone
Character: Emily
Character: Mikhail
Character: Adelaide's Father
Character: Young Adelaide
Character: Ulrika Ehrlich
Character: Lisette Ehrlich
Character: Ood Sigma