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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)