Sylvia Anderson
Lady Penelope Creighton-Ward (voice)

Ray Barrett
John Tracy / The Hood (voice)

Alexander Davion
Space Captain Greg Martin (voice)

Peter Dyneley
Jeff Tracy (voice)

Christine Finn
Tin-Tin Kyrano (voice)

David Graham
Gordon Tracy / Brains / Aloysius Parker (voice)

Paul Maxwell
Captain Paul Travers (voice)

Neil McCallum
Dr. Ray Pierce (voice)

Bob Monkhouse
Space Navigator Brad Newman / Swinging Star Compere (voice)

Shane Rimmer
Scott Tracy (voice)

Charles Tingwell
Dr. Tony Grant / Angry Young Man / Public Relations Officer (voice)

Jeremy Wilkin
Virgil Tracy / Space Exploration Center President (voice)

Matt Zimmerman
Alan Tracy / Messenger (voice)

F. Vivian Dunn
Himself (voice)

Cliff Richard
Cliff Richard Jr. (voice)