Générique complet
Destination Planète Hydra
Leonora Ruffo
Kaena
Mario Novelli
Ingegner Paolo Bardi
Roland Lesaffre
Prof. Solmi
Kirk Morris
Belsy
Gordon Mitchell
Murdu
Alfio Caltabiano
Artie
LM
Leontine May
Luisa Solmi
Nando Angelini
Ingegner Morelli
GA
Giovanni De Angelis
Giulio
Mirella Pamphili
(credit only)
JS
John Sun
Dr. Chang
AH
Antonio Ho
Chinese Secret Agent
JC
John Chen
Chinese Secret Agent
Pietro Francisci
Himself (uncredited)
Renato Montalbano
The Doctor at the casualty department (uncredited)
GS
Gianni Solaro
The Director of the Research Institute (uncredited)
