Meanwhile, psychiatrist Dr. Cardan is informed that one of his patients, Devlon—a serial killer who was obsessed with Satan—escaped a psychiatric hospital and was killed in the process.

Jorge and Oscar bring their friends to the large abandoned mansion, which was owned by Devlon prior to his institutionalization.

The young women, Olivia, Mariana, and Lena, are all angered by this, as each had been lured there under the guise that they would be attending a different type of event.

In the attic, Jorge finds a book of Satanic incantations belonging to Devlon, and proposes that they steal a corpse and attempt to bring it back from the dead.

Meanwhile, young teenager Tony visits the cemetery along with two classmates, Usi and Cesar, along with two younger neighbors, Anita and Raúl, who have been trick-or-treating.

Her tells the children they must burn Devlon's book of incantations to stop the zombies, and sends them back to the house while he wards off the undead with a crucifix.

[2] The film was theatrically released in Mexico in December 1985 and was a notable commercial success in the country despite many Mexican critics' very unfavourable reviews.