Tom Baker

The Doctor

Paul Jones

The Doctor (voice)

Lalla Ward

Romana

David Brierly

K9 (voice)

John Leeson

K9 (voice)

Christopher Neame

Skagra

Denis Carey

Chronotis

Steven O'Donnell

Chronotis (voice)

Daniel Hill

Chris Parsons

Victoria Burgoyne

Clare Keightley

Gerald Campion

Wilkins

Shirley Dixon

Voice of the Computer (voice)