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Tom Baker The Doctor

Lalla Ward Romana (voice)

David Brierly K9 (archive footage) (voice)

Christopher Neame Skagra (voice)

Daniel Hill Chris Parsons (voice)

Denis Carey Professor Chronotis (archive footage)

Victoria Burgoyne Clare Keightley (voice)

Gerald Campion Wilkin (archive footage)

Shirley Dixon The Ship (voice)

Derek Pollitt Dr. Caldera (archive footage)

James Coombes The Krargs (voice)

John Hallet Police Constable

David Strong Man in Car (archive footage)

James Muir Fisherman (archive footage)

Derek Suthern Krarg

Barnaby Edwards Krarg