“Something’s happening with the spiders in this city.” The Doctor, Yaz, Graham and Ryan find their way back to Yorkshire – and Yaz’s family – only to find something is stirring amidst the eight-legged arachnid population of Sheffield. Guest starring Chris Noth, Shobna Gulati, Tanya Fear. Written by Chris Chibnall. Directed by Sallie Aprahamian. 'Arachnids in the UK' will air on BBC One and BBC America on Sunday 28th October.