This Cuban-Mexican co-production marked the feature-film debut of the beloved masked wrestler Santo (Rodolfo Guzman Huerta), who would continue to battle monsters, aliens, and evildoers of all stripes in dozens of films over more than two decades. Here, Santo and El Incognito (co-writer Fernando Oses) foil the plot of a mad scientist to create a zombie army by zapping his innocent victims with electric shocks. Joaquin Cordero and Norma Suarez got top billing in this film co-written by wrestler Enrique J. Zambrano, who also directed the fight sequences and plays a small role. Santo returned in the same year's Santo contra Hombres Infernales.
by Robert Firsching synopsis