When Danny Taylor gives 12 year old Markus Bauer the Action Man known as Sergeant Jeff Muscles, Markus has no idea of the adventures that he is about to be plunged into. Dealing with a couple of bullies is the least of his problems, soon he finds himself being chased by a gang of Chicago crooks and even being shot by one of them! Fortunately as Jeff says "Them bums couldn't hit a barn if they were stood inside it" and Markus is only "creased" (again as Jeff puts it!). Markus decides that he has had enough of being pushed around (to say nothing of being shot at!) and that it's time "TO KICK SOME BUTT!". Soon he and Jeff have lured the gangsters into their jungle and ALL HELL IS ABOUT TO BREAK LOOSE!