A criminal organization hires some ninjas to steal the formula for a new drug, described as cheaper and more powerful than cocaine. As it turns out, the industrialist who financed the research has taken elaborate steps to make sure that the new substance won´t fall into the wrong hands, and the ninjas find they have only succeeded in stealing half the formula. To please their disgruntled employers, the evil ninjas try to blackmail the industrialist into handing over the remaining half and it's up to the Mexican Ninja and his pals to stop him.

An aristocrat changes his name to Billy Jones, and pursues a life as a musician. He leaves England for Los Angeles and becomes famous. When his mother tries to force him to return to running the estate, things get out of control.