Broadcast: Sunday 8th February 2015
6:20am-7:15am AEDT (19:20 GMT) < > « »
BBC UKTV (adverts during broadcast)

Featuring: David Tennant, Catherine Tate, Lesley Sharp

The Doctor is trapped, alone, powerless and terrified, on the leisure planet Midnight. Soon, the knocking on the wall begins. Only a woman called Sky seems to know the truth. What sacrifice must the Doctor make?
Synopsis Source: BBC Australia Site