Peter Capaldi
The Doctor
Matt Lucas
Nardole
Nonso Anozie
Voice of Hydroflax (voice)
Anthony Cozens
Concierge
Alex Kingston
River Song
Phillip Rhys
Ramone
Greg Davies
King Hydroflax
Robert Curtis
Scratch
Clem So
Starline Galactic Villain (uncredited)
Rowan Polonski
Flemming
Chris Lew Kum Hoi
Alphonse