Doctor Who: The Ark in Space
The Doctor encounters a sinister foe lurking on a space station inhabited by humans.
Episode 1
The survivors of Earth lie in hibernation but the Doctor finds there has been an intruder.
Episode 2
The survivors of the human race start to awaken. But The Doctor is concerned...
Episode 3
Humankind faces total destruction. Can the Doctor defeat the Wirrn?
Episode 4
Trapped by the Wirrn, The Doctor and his friends are forced into one last terrible gamble.
