Near the end of the 19th century, Prof. John Mayer and his assistant, the scientist Dr. Isabel Reed, accidentally invent a powerful ray. An alien travels to Earth to destroy the machine since it would be a threat to the universe. He initially possesses the mind of Thomas, a sex maniac and serial killer, to get close to Mayer during the demonstration of the machine to scientists and the military. Mayer's niece, Laura, meets an acquaintance of her uncle, the chemist Dr. Paul Rosten, and Mayer invites him to join the research. When Thomas gets close to Mayer, the alien also possesses his mind in order to destroy the device and his notes. Meanwhile, Thomas is not able to control his murderous impulses and attacks several women with a straight razor.
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Cast
16 people
Boris Karloff
Prof. John Mayer
Known for
How the Grinch Stole Christmas!
Bride of Frankenstein
Enrique Guzmán
Dr. Paul Rosten
Known for
Xico's Journey
Christa Linder
Laura
Known for
Day of Anger
Maura Monti
Dr. Isabel Reed
Known for
The Bat Woman
Your Excellency
Yerye Beirute
Thomas
Also in
Face of the Screaming Werewolf
The Vampire's Coffin
Tere Valez
Nancy
No other roles listed
Griselda Mejía
Prostitute
Also in
Huele a gas
Esta noche cena Pancho
Sergio Kleiner
Alien
Known for
Dulce Desafío
Fando and Lis
Mariela Flores
Deaf-mute victim
Also in
Tonta tonta, pero no tanto
¡El que no corre... vuela!
Tito Novaro
Gen. Nord
Known for
The Circus
Los hijos de María Morales
Sergio Virel
Villager
Known for
The Young and the Damned
Nathanael León
Villager
Known for
Night of the Bloody Apes
Jack Hill Director · Juan Ibáñez Director José Luis González de León Director
United States release April 1, 1971 · Produced in Mexico, United States · Languages English, Spanish
Production
Azteca Films
Production
Filmica Vergara S.A.
Production
Parasol Group
Production
Columbia Pictures
Production
Mexico · United States
Produced in
Languages
Original title
Invasión Siniestra
Original language
Spanish
Spoken on screen
English · Spanish
Release dates
United States · April 1, 1971
Theatrical
Germany
July 2, 1991 · TV · TV premiere
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