Peter Dyneley

Jeff Tracy / Commander Norman (voice)

Shane Rimmer

Scott Tracy (voice)

David Holliday

Virgil Tracy (voice)

Matt Zimmerman

Alan Tracy (voice)

David Graham

Gordon Tracy / Brains / Morrison / Bob Gray / Solarnaut Asher / Captain Hanson / Frank / Dave Clayton (voice)

Ray Barrett

Eddie Houseman / J.B. Lester / Colonel Harris / Fireflash Co-Pilot / Assistant Controller / Bridge Controller (voice)

Sylvia Anderson

Chip Morrison / Lady Penelope Creighton-Ward (voice)

Christine Finn

Tin-Tin Kyrano (voice)

John Tate

Solarnaut Camp (voice) (uncredited)