Peter Dyneley

Jeff Tracy / World Navy Commander (voice)

Shane Rimmer

Scott Tracy (voice)

Jeremy Wilkin

Virgil Tracy / Dick O'Shea / Cravitz (voice)

Matt Zimmerman

Alan Tracy / Atom Sub Reefer Lieutenant (voice)

David Graham

Gordon Tracy / Parker / Brains / Atlantic Captain (voice)

Ray Barrett

John Tracy / Atom Sub Reefer Captain / TV Reporter (voice)

Sylvia Anderson

Lady Penelope Creighton-Ward (voice)

Christine Finn

Tin-Tin Kyrano (voice)

John Tate

Frank Hooper / Sir Harry (voice) (uncredited)