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)