 | Lang Jeffries als George Collins |
 | Aurora de Alba als Olga |
 | Rafael Bardem als Professor Calvert |
 | Eleonora Bianchi |
 | Gloria Fernán Osuna |
 | Wladimiro Tuicovich |
| Ángel Jordán |
 | Moa Tahi |
| Joe Kamel |
| Nando Angelini |
 | Gianni Solaro als C.I.A. Manager |
| Aldo Bonamano |
| Andrea Scandurra |
 | Rocco Lerro als A lab guardian (uncredited) |
| Alberto De Rossi | Writer |
| Ricardo Torres | Director of Photography |
| Piero Umiliani | Music |
| Tanio Boccia | Writer |
| Fernando Vitali | Writer |
| Ángel Serrano | Editor |
| H. S. Valdés | Writer |
| Tanio Boccia | Director |
| Mario Moroni | Writer |
| Saverio D'Eugenio | Production Design |
| Nicola Tamburo | Set Decoration |
| Giorgio Desideri | Costume Design |
| Antonietta Caputo | Hairstylist |
| Emilia Fernández Cid | Hairstylist |
| Duilio Giustini | Makeup Artist |
| Paolo Prestano | Production Manager |
| Luigi Rotolo | General Manager |
| Mario Casalini | Assistant Director |
| Ángel Falquina | Assistant Director |
| Ángel Forqué | Assistant Director |
| Armando Loffredi | Sound |
| Luis Rodríguez | Sound |
| Giovanni Stacchini | Special Effects |
