After failing to impress his crush at the carnival, being told that he is too short for a ride called the Super Loops, 13 year old Josh Baskin finds a Zoltar machine and makes a wish to be big. When the machine produces a card saying your wish is granted, Josh notices the machine is unplugged. He wakes up the next morning in the body of an adult but he still has the same child-like personality. With the help of his best friend, Billy, Josh learns how to act like a grown up. But as he gets a girlfriend and a fun job, he doesn't want to be a kid again.