Agent Joaquin recalls his latest mission while lying wounded in an ambulance: Joaquin has infiltrated into a band of smugglers. When the villains learn the truth about him, they kidnap Jouqin's fiancee. Santo comes to her rescue and fights the band.

• Joaquín Cordero
• Jorge Marx
• El Santo
• Gina Romand
• Fernando Osés
• Enrique Zambrano