Doctor Who: -  Midnight

This week on Doctor Who: Midnight, the Doctor (David Tennant) is trapped, alone, powerless and terrified, on the leisure planet Midnight.

Soon, the knocking on the wall begins. Only a woman called Sky (Lesley Sharp - Clocking Off, Afterlife) 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...