Shane Rimmer

Scott Tracy (voice)

David Holliday

Virgil Tracy (voice)

Matt Zimmerman

Alan Tracy / Hector McGill (voice)

David Graham

Gordon Tracy / Brains / Culp (voice)

Ray Barrett

John Tracy / Dr. Orchard (voice)

Peter Dyneley

Jeff Tracy (voice)

Christine Finn

Tin-Tin Kyrano / Grandma Tracy (voice)

Sylvia Anderson

Mrs. Files (voice)

John Tate

Blackmer (voice) (uncredited)