Mil Mascaras investigates a nest of fifth-columnists operating out of a carnival (!) led by a Nazi (John Carradine) attempting to resurrect the Third Reich posing as a circus clown . Mil Mascaras investigates a nest of fifth-columnists operating out of a carnival (!) led by a Nazi (John Carradine) attempting to resurrect the Third Reich posing as a circus clown . Mil Mascaras investigates a nest of fifth-columnists operating out of a carnival (!) led by a Nazi (John Carradine) attempting to resurrect the Third Reich posing as a circus clown . Mil Mascaras investigates a nest of fifth-columnists operating out of a carnival (!) led by a Nazi (John Carradine) attempting to resurrect the Third Reich posing as a circus clown .