An ancient Chinese artifact has been stolen by a villainous archaeologist named Dexter. With the help of his Lemming friends, Norm must keep his word and embark on a journey…

Norm and his oldest son travel back to New York to receive the key to the city.

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…