Tom Baker

The Doctor / Narrator

Lalla Ward

Romana

David Brierley

K-9 (voice)

Christopher Neame

Skagra

Denis Carey

Professor Chronotis

Daniel Hill

Chris Parsons

Victoria Burgoyne

Clare Keightley

Gerald Campion

Wilkin

Derek Pollitt

Dr. Caldera

Shirley Dixon

The Ship (voice)

John Hallet

Police Constable

David Strong

Passenger

Graham Cole

Krarg

Pennant Roberts