José Luis Cerrada

Victor and Elena are newlyweds and lead a busy social life. While Victor is cultured and quiet, Elena is beautiful, brilliant and restless, constantly criticized by her mother, also named Elena, who is very refined, correct and bourgeois. The three of them will be involved in a rather ambiguous and at the same time terribly moving moment in their lives.

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.