On a remote Army outpost, a fearsome alien warlord – the Fisher King – sets in motion a twisted plan to ensure his own survival. The ripples will be felt around the universe. Is this chain of events inevitable? And can the Doctor do the unthinkable?
Writer: Toby Whithouse
Director: Daniel O’Hara
Producer: Derek Ritchie
Starring: Peter Capaldi and Jenna Coleman
Guest cast: Colin McFarlane, Sophie Stone, Zaqi Ismail, Morven Christie, Arsher Ali, Steven Robertson, Paul Kaye, Neil Fingleton, Peter Serafinowicz