One day, a monster from outer space attacks Earth and even Superman can no longer be counted on. It seems Earth’s last hope lies in…a dork and a rice cooker?

Grown up in a small fishing village, McDull has no black mask, no red underwear, not to mention superpower. McDull has such an ambition that with his great enthusiasm for science, he will one day become an inventor. Suddenly, a giant monster invades Earth and defeats the widely believed Earth hero - Superman. At this critical moment, people from all over the world are called for participation in an international robot competition to find the most powerful robot to fight the monster.

With no much resource but some cheap home appliances, McDull converts a rice cooker into his world-saving robot: the Rizo. Unexpectedly, McDull’s low-tech invention enters the final competition. The news excites the whole village. Not only Mrs. Mak’s works day and night to meet the expense, but Principal and many others offer McDull with abundant support. Finally, McDull and Rizo set off for final contest. Rizo looks clumsy and its functions seem so ordinary. Nevertheless, as the competition turns fierce and ugly, Rizo’s unbelievable endurance makes it the final champion.

Like this, McDull and Rizo suddenly become the hope of Earth. Whereas the monster could come again anytime, some scheme is going on among the heads of states… Will McDull and Rizo, the partners that are once ridiculed, be the world savior? Why does the monster attack Earth over and over again?