Mario Moreno portrays a professor in this movie. A small town in the middle of no where requests the school Mario Moreno is working in for a teacher. He ends up going to give the town a hand. When he arrives he comes to know the corrupt leaders who through out the movie try to make him leave. Although he is being harassed you can see how much he cares for the kids and their circumstances. He deals with problems by using his hilarious comments.

Landru, a French businessman, arrives Mexico with the idea of ​​promoting their fighters, what nobody knows is that besides Landru promoter and fighter is a mad scientist who seeks to alter human genetics mixing it with the animal to make stronger and fiercer to their gladiators.

Cowboy-hero series, first of two. Sequel: Pistoleros de la frontera.