The Doctor
William Hartnell
Steven Taylor
Peter Purves
Guardian
Paul Greenhalgh
Monoid
Edmund Coulter
Frank George
Ralph Carrigan
John Caesar
Monoid Voice
Roy Skelton
John Halstead
Maharis
Terence Woodfeld
Dassuk
Brian Wright
Venussa
Eileen Helsby
Dodo Chaplet
Jackie Lane
Yendom
Terence Bayler
Refusian Voice
Richard Beale
Commander
Eric Elliott
Zentos
Inigo Jackson
Manyak
Roy Spencer
Rhos
Michael Sheard
Mellium
Kate Newman
Baccu
Ian Frost
Stephanie Heesom
Music
Tristram Cary
Script Editor
Gerry Davis
Director
Michael Imison
Writer
Paul Erickson
Lesley Scott
Producer
John Wiles