Jimmy Neutron is a little kid with a big brain who has understanding parents who give him the liberty to exercise his inventive streak. They don’t mind that their basement is full of gadgets that would have NASA astrophysicists scratching their heads, but when Jimmy’s backpack rocket causes havoc, his mum grounds him. But Jimmy wouldn’t want to miss the opening of a new fun-park, so he sneaks out. While he’s out, his communications system finally makes contact with extra-terrestrials who kidnap not only Jimmy’s parents, but all the parents in Retroville. Now, only Jimmy’s bulging brain, with help from his robotic dog Goddard, best friend Carl and their other school chums, can save the day.