Gerry Anderson

Jeremy Hitchen

Dr. 'Tiger' Ninestein (voice) / Lt. Hiro (voice)

Denise Bryer

Mary Falconer (voice) / Zelda (voice)

Anne Ridler

Cy-Star (voice) / It-Star (voice) / Kate Kestrel (voice)

Windsor Davies

Sergeant Major Zero (voice)

Robbie Stevens

Hawkeye / Space Sergeant 101 / Yung-Star / HUDSON / Dix-Huit / Stew Dapples / Five-Five(voice)