A cowboy and his sidekick meet a ranching family that is haunted by spirits and vampires.

Los "Diablos del Terror" son jinetes enmascarados que dejan en las manos de sus víctimas una pequeña cara de Satanás tallada en plata.

In Sierra Negra, graverobbers Barraza and Mendoza steal the coffin of Count Karol de Lavud, before heading to a hospital. Barraza sees a medallion upon the coffin's opening and demands more money from Mendoza. Meanwhile, Marta González, recovering from traumatic events, works as a nurse with Dr. Saldívar. When Barraza removes the wooden stake in order to steal Lavud's medallion, the vampire returns to life and begins a crime spree, hunting down Marta to marry her.