Ncuti Gatwa as The Doctor

Millie Gibson as Ruby Sunday

Jemma Redgrave as Kate Lethbridge-Stewart

Yasmin Finney as Rose Noble

Alexander Devrient as Colonel Christofer Ibrahim

Lenny Rush as Morris Gibbons

Genesis Lynea as Harriet Arbinger

Aidan Cook as The Vlinx

Nicholas Briggs as The Vlinx (voice)

Susan Twist as Susan Triad

Fela Lufadeju as Bailey Sinclair

Bonnie Langford as Melanie Bush

Michelle Greenidge as Carla Sunday

Anita Dobson as Mrs Flood

Angela Wynter as Cherry Sunday

Tachia Newall as Colonel Winston Chidozie

Gabriel Woolf as Sutekh (voice)

Jasmine Bayes as Corporal Alice Sullivan

Sian Clifford as Kind Woman

Amol Rajan as Amol Rajan (archive footage)

Aneurin Barnard as Roger ap Gwilliam (archive footage)

Faye McKeever as Louise Miller

Tom Baker as The Doctor (archive footage) (uncredited)

Elisabeth Sladen as Sarah Jane Smith (archive footage) (uncredited)