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.