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Tom Baker
The Doctor

Lalla Ward
Romana

David Brierly
K-9 (voice)

Christopher Neame
Skagra

Daniel Hill
Chris Parsons

Denis Carey
Professor Chronotis

Victoria Burgoyne
Clare Keightley

Gerald Campion
Wilkin

Shirley Dixon
The Ship (voice)

Derek Pollitt
Dr. Caldera

James Coombes
The Krargs (voice)

John Hallet
Police Constable

David Strong
Passenger

James Muir
Fisherman

Derek Suthern
Krarg

Barnaby Edwards
Krarg