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

Derek Martinus