George is bored. He's played with each of his toys so much they're played out. Even the zoopercar. The only thing that will bring fun back into his life is the hot new toy, the constructomatic. When the constructomatic finally does arrive, George not only builds a fun machine to play with, but also to clean up the house. However, the best-laid plans of mice and George go astray as the contructomatic proceeds to trash George's other toys. George learns the true meaning of fun as he enlists his old toys to stop the rampaging new one.