Presented in Supercolorisation

Nicholas Parsons

Sheriff Tex Tucker / Telegraph Operator Dan Morse (voice)

Kenneth Connor

Dusty the Dog / Rocky the Horse / Foreman (voice)

Denise Bryer

Martha 'Ma' Jones (voice)

Graydon Gould

Mike Mercury / Jason Munroe III (voice), Mike Mercury / Film Narrator (voice)

George Murcell

Professor Rudolph Popkiss / Black Morgan (voice), Professor Rudolph Popkiss (voice) (credit only)

David Graham

Professor Matthew Matic / Lieutenant Ninety / Zoonie the Lazoon / Zodan / Warrior Countdown (voice), Professor Matthew Matic / Lieutenant Ninety / Freighter A14 (voice), Professor Mattew 'Matt' Matic / Lieutenant Ninety / Zoonie the Lazoon / Doctor Baker (voice), Grandpa Ebenezer Twink / Hank (voice), Dr. Horatio Beaker / Mitch the Monkey / Morse Operator (voice), Dr. Horatio Beaker / Mitch the Monkey / Herman Gredenski (voice)

Sylvia Anderson

Jimmy Gibson (voice) (uncredited), Jimmy Gibson / Miss Chevenitch (voice) (uncredited), Doctor Venus / Eleanor Zero / Jonathan Zero (voice), Dcotor Venus (voice), Doctor Venus (voice)

Paul Maxwell

Colonel Steve Zodiac (voice), Colonel Steve Zodiac / Mrs Doughty (voice)

Gerry Anderson

Robert the Robot (voice) (uncredited), Robert the Robot / Granatoid 1 (voice) (uncredited)

John Bluthal

Commander Wilbur Zero / Kazak (voice), Commander Wilbur Zero / Doctor Simpson (voice), Commander Wilbur Zero / Jock Campbell (voice)