Guest Stars Nicholas Briggs voices Cybermen Jacob Anderson as Inston-Vee Vinder Rochenda Sandall as Azure Bhavnisha Parmar as Sonya Khan Jo Martin as The Doctor Sam Spruell as Swarm Craige Els as Karvanista Steve Oram as Joseph Williamson Nadia Albina as Diane Jonny Mathers as Passenger Thaddea Graham as Bel Barbara Flynn as Tecteun Craig Parkinson as Grand Serpent Matthew Needham as Old Swarm Nigel Richard Lambert voices Priest Triangle Amanda Drew voices Mouri Chantelle Pierre as Police Officer