A scientist discovers the formula of a particular resistant steel, and a spy ring from an enemy power sets after him to obtain it.
| Actor | Role |
|---|---|
 Peter van EyckKramer / Jack Haskins | Kramer / Jack Haskins |
 Mikaela WoodAnne Bardot | Anne Bardot |
 Klausjürgen WussowJohansson / Bonnard | Johansson / Bonnard |
 António VilarPierre Genet / Dick | Pierre Genet / Dick |
 Corny CollinsJenny Renoir | Jenny Renoir |
 Letícia RománEthel / Ellen Green | Ethel / Ellen Green |