Tom Baker

The Doctor

Matthew Waterhouse

Adric

Sarah Sutton

Nyssa

Geoffrey Beevers

Melkur (voice) / The Master

Anthony Ainley

Tremas / The Master

Sheila Ruskin

Kassia

Denis Carey

The Keeper

John Woodnutt

Seron

Margot Van der Burgh

Katura

Robin Soans

Luvic

Roland Oliver

Neman

Liam Prendergast

Foster

Philip Bloomfield

Foster

Graham Cole

Melkur