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