Overview

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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Actors


David Tennant

The Doctor


Lindsay Duncan

Captain Adelaide Brooke


Peter O'Brien

Ed Gold


Sharon Duncan-Brewster

Maggie Cain


Gemma Chan

Mia Bennett


Aleksandar Mikic

Yuri Kerenski


Michael Goldsmith

Roman Groom


Cosima Shaw

Steffi Ehrlich


Joplin Sibtain

Tarak Ital

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