Santo goes up against the vampire Baron Brakola, who has returned to seek vengeance on the descendants of the Knight in the Silver Mask (Santo's colonial era ancestor).
El Santo
as Santo
Fernando Osés
as Baron Brákola
Mercedes Carreño
as Silvia (as Mercedes Carreño)
Antonio de Hud
as Eduardo
Andrea Palma
as Rebeca's Mother
Ada Carrasco
as Aurora
Susana Robles
as Rebeca
