Two bored youngsters are led on a series of zany misadventures when a manic moggy comes knocking at their door with a magical stovepipe hat on his head and mischief in mind. Comedy fantasy based on the children's book by Dr Seuss, starring Mike Myers, Alec Baldwin, Dakota Fanning and Spencer Breslin.

During a rainy day, and while their mother is out, Conrad and Sally, and their pet fish, are visited by the mischievous Cat in the Hat. Fun soon turns to mayhem, and the siblings must figure out how to rid themselves of the maniacal Cat.