From the back of the North American GBA box Bumbling Biceps! The world of wrestling will never be the same! ...because now there is a new kid in town - Kid Muscle! His unwilling arrival on Earth comes conspicuosly to the legendary Muscle League Champions' embarassing beating at the hands of the d.M.p, a devious new breed of evil wrestling super villans. The Muscle League has recruited King Muscle's own son to reinvigorate their failing fortunes! And they've inlisted and trained a whole new generation of heroes to take on the diabolical d.M.p and save the planet!