Patrick Troughton as The Doctor

Frazer Hines as Jamie McCrimmon

Deborah Watling as Victoria Waterfield

Peter Barkworth as Clent

Peter Sallis as Penley

Wendy Gifford as Miss Garrett

Angus Lennie as Storr

Peter Diamond as Davis

George Waring as Arden

Malcolm Taylor as Walters

Roy Skelton as Voice of the Computer

Bernard Bresslaw as Varga

Roger Jones as Zondal

Sonny Caldinez as Turoc

Michael Attwell as Isbur

Tony Harwood as Rintan