A young heiress is kidnapped by two aspiring thieves who are then captured by a mad scientist. It's up to the police, Santo, and Blue Demon to rescue them.
| Actor | Role |
|---|---|
 El SantoSanto el Enmascarado de Plata | Santo el Enmascarado de Plata |
 Blue DemonBlue Demon | Blue Demon |
 Víctor JuncoProfesor | Profesor |
 César del CampoTony | Tony |
 Elsa CárdenasNora | Nora |
| AAntonio de HudPedro | Pedro |
 Fernando OsésSantos | Santos |
 Quintín BulnesLucky | Lucky |
| AAlma FerrariSusana | Susana |
| MMaría Antonia del RíoLorna | Lorna |
| CCarlos SuárezNot listed | Not listed |
| IIsmael RamirezNot listed | Not listed |
| RRoberto LozoyaNot listed | Not listed |
| IIvan CurielNot listed | Not listed |
| MMiguel Ángel HerreraNot listed | Not listed |
| CCavernario GalindoNot listed | Not listed |
| EEl Enmascarado NegroNot listed | Not listed |