Ncuti Gatwa The Doctor Actor Millie Gibson Ruby Sunday Actor Jemma Redgrave Kate Lethbridge-Stewart Actor Bonnie Langford Melanie Bush Actor Yasmin Finney Rose Noble Actor Alexander Devrient Colonel Ibrahim Actor Lenny Rush Morris Gibbons Actor Genesis Lynea Harriet Actor Susan Twist Susan Triad Actor Michelle Greenidge Carla Sunday Actor Anita Dobson Mrs Flood Actor Angela Wynter Cherry Sunday Actor Tachia Newall Colonel Chidozie Actor Jasmine Bayes Corporal Sullivan Actor Aidan Cook The Vlinx Actor Fela Lufadeju Bailey Sinclair Actor Nicholas Briggs The Vlinx Voice Russell T. Davies Executive Producer, Writer Julie Gardner Executive Producer Jane Tranter Executive Producer Joel Collins Executive Producer Phil Collinson Executive Producer Vicki Delow Producer Jamie Donoughue Director