The Doctor
William Hartnell
Barbara Wright
Jacqueline Hill
Hillo
Martin Jarvis
Hetra
Ian Thompson
Nemini
Barbara Joss
Zarbi
Robert Jewell
Jack Pitt
Gerald Taylor
Hugh Lund
Kevin Manser
John Scott Martin
Ian Chesterton
William Russell
Vicki
Maureen O'Brien
Animus (voice)
Catherine Fleming
Vrestin
Roslyn de Winter
Hrostar
Arne Gordon
Hrhoonda
Arthur Blake
Hlynia
Jolyon Booth
Jocelyn Birdsall
Director
Richard Martin
Producer
Verity Lambert
Costume Design
Daphne Dare
Sound
Ray Angel
Makeup Artist
Sonia Markham
Editor
Gitta Zadek
Choreographer
Camera Operator
Peter Hamilton
Lighting Director
Ralph Walton
Writer
Bill Strutton
Script Editor
Dennis Spooner