Sylvia Anderson

Lady Penelope Creighton-Ward (voice)

David Graham

Brains / Parker / Olsen / Captain Savidge / Hitchins (voice)

Peter Dyneley

Jeff Tracy (voice)

Shane Rimmer

Scott Tracy (voice)

David Holliday

Virgil Tracy (voice)

Matt Zimmerman

Alan Tracy / Banino / Macklin / Foreign Lieutenant (voice)

Ray Barrett

John Tracy / Cass Carnaby / Commander, Matthews Field / Radio Maxwell DJ (voice)

Christine Finn

Tin-Tin Kyrano / Grandma Tracy (voice)

John Tate

Maxie / Scheiler / Foreign Colonel (voice) (uncredited)