David Graham

Parker / Brains (voice)

Sylvia Anderson

Lady Penelope (voice)

Shane Rimmer

Scott Tracy (voice)

David Holliday

Virgil Tracy (voice)

Francis Matthews

Captain Scarlet (voice)

Ed Bishop

Captain Blue (voice)

Donald Gray

The Mysterons / Colonel White / Captain Black (voice)

Paul Maxwell

Steve Zodiac / Captain Grey (voice)

Gerry Anderson

Robert the Robot (voice, uncredited)