Doctor Who: Midnight

The Doctor is trapped, alone, powerless and terrified, on the planet Midnight, as the knocking on the wall begins, in this week's Doctor Who on BBC One.

Only a woman called Sky (Lesley Sharp) seems to know the truth. But as paranoia turns into a witch-hunt, Sky turns the Doctor's greatest strengths against him, and a sacrifice must be made.

David Tennant plays the Doctor and Catherine Tate plays his companion Donna Noble.

Lesley Sharp, Lindsey Coulson and David Troughton guest star.

Doctor Who: Midnight (series 4, episode 10/13), BBC One, Saturday 14 June 2008, 7.10pm.