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Patrick Troughton
The Doctor

Frazer Hines
Jamie McCrimmon

Deborah Watling
Victoria Waterfield

Peter Barkworth
Clent

Peter Sallis
Penley

Wendy Gifford
Miss Garrett

Angus Lennie
Storr

Peter Diamond
Davis

George Waring
Arden

Malcolm Taylor
Walters

Roy Skelton
Voice of the Computer

Bernard Bresslaw
Varga

Roger Jones
Zondal

Sonny Caldinez
Turoc

Michael Attwell
Isbur

Tony Harwood
Rintan