Plot: Conrad and Sally Walden (Spencer Breslin and Dakota Fanning) are home alone with their pet fish. It is raining outside, and there is nothing to do. Until The Cat in the Hat ('Mike Myers') walks in the front door. He introduces them to their imagination, and at first it's all fun and games, until things get out of hand, and The Cat must go, go, go, before their mother gets back, but their pompous neighbor has bigger plans for them.
Alternative Plot: In this live-action film based on the favorite children's tale, the trouble-making Cat in the Hat (Mike Myers) arrives at the home of bored young Sally Walden (Dakota Fanning) and her brother, Conrad (Spencer Breslin), while their mother (Kelly Preston) is out. The family's pet fish (Sean Hayes) objects to the Cat's presence, but that doesn't stop the hat-wearing giant feline from trying to have fun, no matter how much destruction is left in his wake.