Plot
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.
| Writer | Russell T Davies |
|---|---|
| Director | Graeme Harper |
| Actor | David Tennant, Lindsay Duncan, Peter O'Brien |
| Country | United Kingdom |
| Production | BBC Cymru Wales |
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