The Doctor
Patrick Troughton
Jamie McCrimmon
Frazer Hines
Voice of the Computer
Roy Skelton
Varga
Bernard Bresslaw
Zondal
Roger Jones
Turoc
Sonny Caldinez
Isbur
Michael Attwell
Rintan
Tony Harwood
Victoria Waterfield
Deborah Watling
Clent
Peter Barkworth
Penley
Peter Sallis
Miss Garrett
Wendy Gifford
Storr
Angus Lennie
Davis
Peter Diamond
Arden
George Waring
Walters
Malcolm Taylor
Director
Derek Martinus
Music
Dudley Simpson
Writer
Brian Hayles
Producer
Innes Lloyd
Script Editor
Peter Bryant