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.

Cast: Joaquín Cordero, Gina Romand, Enrique Zambrano, Jorge Marx, Fernando Osés, Juanito Tremble