When Earth astronaut Capt. Chuck Baker arrives on Planet 51 -- a world reminiscent of American suburbia circa 1950 -- he tries to avoid capture, recover his spaceship and make it home safely, all with the help of an empathetic little green being.

A young girl named June with a big imagination makes an incredible discovery -- the amusement park of her dreams has come to life. Filled with the world's wildest rides operated by fun-loving animals, the excitement never ends. But when trouble hits, June and her misfit team of furry friends begin an unforgettable journey to save the park.

A criminal produces an uncontrollable laughter to the population and Mortadelo and Filemón will have to stop him.