German, Japanese and Italian agents are sent to Mexico to plan an invasion.

Guadalupe Padilla, a Mexican bandit, is released from the prison where he is incarcerated just before he is executed. The farm where Padilla goes in hiding happens to be a nest of Italian, German and Japanese spies. He sees red, for even if he is an outlaw, Guadalupe is first and last a pure Mexican: never will he let those obnoxious axis agents invade his cherished motherland...—Guy Bellinger