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 ,
as The Doctor
as Captain Adelaide Brooke
