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

Tim Bentinck

The Doctor (body double)

Toby Hadoke

Continuity Announcer (voice)