David Holliday

Virgil Tracy (voice)

Sylvia Anderson

Lady Penelope Creighton-Ward (voice)

David Graham

Gordon Tracy / Brains (voice)

Shane Rimmer

Scott Tracy (voice)

Peter Dyneley

Jeff Tracy (voice)

Christine Finn

Acteur

Jeremy Wilkin

Virgil Tracy (voice)

Ray Barrett

Atom Sub Reefer Captain / TV Reporter (voice)

Matt Zimmerman

Press Officer / 2nd Reporter (voice)

Paul Maxwell

Acteur

Charles Tingwell

Acteur

John Tate

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