<Li> Alec Baldwin as Larry Quinn, the Waldens' pompous, lazy, unemployed next - door neighbor . He is revealed to be allergic to cats, steals food from the Waldens and gets away with it, and is determined to both marry Joan for her wealth and send Conrad to military school to straighten up his behavior . </Li> <Li> Amy Hill as Mrs. Kwan, an elderly Taiwanese woman who gets hired to watch the kids, though she sleeps through her job . Her weight and sleep serves as a running gag . She sits down on the couch to watch brawling in Taiwanese parliament . </Li> <Li> Sean Hayes as Mr. Hank Humberfloob, Joan's boss . Hayes is also the voice of the family fish . </Li> <Li> Danielle Chuchran and Taylor Rice as Thing One, and Brittany Oaks and Talia - Lynn Prairie as Thing Two; two gibbering trouble - making creatures that the Cat brings in with him . Dan Castellaneta provided the voices for both Things . </Li>

Who plays the fish in cat in the hat