Ncuti Gatwa The Doctor Actor Varada Sethu Belinda Chandra Actor Millie Gibson Ruby Sunday Actor Michelle Greenidge Actor Susan Twist Actor Jonah Hauer-King Conrad Clark Actor Anita Dobson Mrs Flood Actor Angela Wynter Actor Jemma Redgrave Kate Lethbridge-Stewart Actor Bonnie Langford Actor Ruth Madeley Shirley Bingham Actor Sienna-Robyn Mavanga-Phipps Poppy Actor Thomas Storey Tombo Actor Adrian Pang Consultant Actor Nicholas Briggs Voice of the Robots Actor Inua Ellams Market Seller Actor, Writer Nila Aalia Lakshmi Chandra Actor Sam Lawton Winnie Petheridge Actor Alexander Devrient Colonel Christofer Ibrahim Actor Aidan Cook The Vlinx Actor Russell T. Davies Writer, Executive Producer Jane Tranter Executive Producer Phil Collinson Executive Producer Juno Dawson Writer Pete McTighe Writer Julie Gardner Executive Producer, Producer Amanda Brotchie Director Joel Collins Executive Producer, Producer Chris May Producer, Director Vicki Delow Producer Alex Pillai Director Peter Hoar Director Makalla McPherson Director Ben A. Williams Director