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.
Cast
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
Alan Ruscoe
Andy Stone
Lily Bevan
Emily
Max Bollinger
Mikhail
Charles De'Ath
Adelaide's Father
Rachel Fewell
Young Adelaide
Anouska Strahnz
Ulrika Ehrlich
Zofia Strahnz
Lisette Ehrlich
Paul Kasey
Ood Sigma
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