Tonight is another new episode on BBC One/BBC America with the penultimate episode of season/series 10.

Episode Description: A huge spaceship trapped in the gravity well of a black hole, teeming with impossible lifeforms, harbours one of the Doctor’s most feared enemies… Mondasian Cybermen.

Friendship drives the Doctor into the rashest decision of his life. Trapped on a giant spaceship, caught in the event horizon of a black hole, he witnesses the death of someone he is pledged to protect. Is there any way he can redeem his mistake? Are events already out of control? For once, time is the Time Lord’s enemy…