A series of inexplicable murders occur at a space research center. The only survivor is a doctor who claims to remember nothing. A group of men discover that "The Beast" has returned, and that it is an emissary from another planet, with strength superior to that of humans. Will they be able to destroy it in time?
| Actor | Role |
|---|---|
 Mario AlmadaCarlos Rusteguí | Carlos Rusteguí |
| LLuis ReynosoArturo Córdoba | Arturo Córdoba |
 Roberto BallesterosLt. Col. José Luis López Escobar | Lt. Col. José Luis López Escobar |
 Guillermo QuintanillaCaptain Álvarez | Captain Álvarez |
| PPerla JassoSofia | Sofia |
 Lucía MuñozDr. Elizabeth Hastin | Dr. Elizabeth Hastin |
| MMarcos AlmadaCommandant | Commandant |
| EEdmundo GaleasyCarlos Figueroa | Carlos Figueroa |
| AAndreas PearsChavito | Chavito |