The Doctor and Ruby Sunday have faced the Bogeyman, fought against Maestro, and survived the battlefield of Kastarion 3. In the epic two-part season finale, The Doctor and Ruby arrive at UNIT headquarters on a top-secret mission and a long-buried secret awaits…
Ncuti Gatwa The Doctor
Millie Gibson Ruby Sunday
Jemma Redgrave Kate Lethbridge-Stewart
Yasmin Finney Rose Noble
Alexander Devrient Colonel Christofer Ibrahim
Lenny Rush Morris Gibbons
Genesis Lynea Harriet Arbinger
Aidan Cook The Vlinx
Nicholas Briggs The Vlinx (voice)
Susan Twist Susan Triad
Fela Lufadeju Bailey Sinclair
Bonnie Langford Melanie Bush
Michelle Greenidge Carla Sunday
Anita Dobson Mrs Flood
Angela Wynter Cherry Sunday
Tachia Newall Colonel Winston Chidozie
Gabriel Woolf Sutekh (voice)
Jasmine Bayes Corporal Alice Sullivan
Sian Clifford Kind Woman
Amol Rajan Amol Rajan (archive footage)
Aneurin Barnard Roger ap Gwilliam (archive footage)
Faye McKeever Louise Miller
Tom Baker The Doctor (archive footage) (uncredited)
Elisabeth Sladen Sarah Jane Smith (archive footage) (uncredited)
- Ncuti GatwaThe Doctor
- Millie GibsonRuby Sunday
- Jemma RedgraveKate Lethbridge-Stewart
- Yasmin FinneyRose Noble
- Alexander DevrientColonel Christofer Ibrahim
- Lenny RushMorris Gibbons
- Genesis LyneaHarriet Arbinger
- Aidan CookThe Vlinx
- Nicholas BriggsThe Vlinx (voice)
- Susan TwistSusan Triad
- Fela LufadejuBailey Sinclair
- Bonnie LangfordMelanie Bush
- Michelle GreenidgeCarla Sunday
- Anita DobsonMrs Flood
- Angela WynterCherry Sunday
- Tachia NewallColonel Winston Chidozie
- Gabriel WoolfSutekh (voice)
- Jasmine BayesCorporal Alice Sullivan
- Sian CliffordKind Woman
- Amol RajanAmol Rajan (archive footage)
- Aneurin BarnardRoger ap Gwilliam (archive footage)
- Faye McKeeverLouise Miller
- Tom BakerThe Doctor (archive footage) (uncredited)
- Elisabeth SladenSarah Jane Smith (archive footage) (uncredited)