Sylvia Anderson

as Lady Penelope Creighton-Ward (voice)

Ray Barrett

as John Tracy / The Hood (voice)

Alexander Davion

as Space Captain Greg Martin (voice)

Peter Dyneley

as Jeff Tracy (voice)

Christine Finn

as Tin-Tin Kyrano (voice)

David Graham

as Gordon Tracy / Brains / Aloysius Parker (voice)

Paul Maxwell

as Captain Paul Travers (voice)

Neil McCallum

as Dr. Ray Pierce (voice)

Bob Monkhouse

as Space Navigator Brad Newman / Swinging Star Compere (voice)

Shane Rimmer

as Scott Tracy (voice)

Charles Tingwell

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

Jeremy Wilkin

as Virgil Tracy / Space Exploration Center President (voice)

Matt Zimmerman

as Alan Tracy / Messenger (voice)

F. Vivian Dunn

as Himself (voice)

Cliff Richard

as Cliff Richard Jr. (voice)