Tom Baker
The Doctor
Matthew Waterhouse
Adric
Sarah Sutton
Nyssa
Geoffrey Beevers
Melkur (voice) / The Master
Anthony Ainley
Tremas / The Master
Sheila Ruskin
Kassia
D
Denis Carey
The Keeper
John Woodnutt
Seron
M
Margot Van der Burgh
Katura
Robin Soans
Luvic
R
Roland Oliver
Neman
L
Liam Prendergast
Foster
P
Philip Bloomfield
Foster
Graham Cole
Melkur