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...
Elenco: Matt Smith , David Tennant , Arthur Darvill , Karen Gillan , Jenna Coleman , Peter Capaldi , Jodie Whittaker , Billie Piper , Mandip Gill , Bradley Walsh , Tosin Cole , Christopher Eccleston , Freema Agyeman , Catherine Tate , Pearl Mackie , Matt Lucas , John Bishop .