Dakota Fanning
Sally Walden
Spencer Breslin
Conrad Walden
Sean Hayes
Mr. Humberfloob / Fish (voice)
Danielle Chuchran
Thing One
Talia-Lynn Prairie
Thing Two
Dan Castellaneta
Thing One / Thing Two (voice)
Victor Brandt
Narrator (voice)
Frank Welker
Nevins (voice)
Clint Howard
Kate the Caterer
Steven Anthony Lawrence
Dumb Schweitzer
Paris Hilton
Female Club-Goer
Stephen Hibbert
Jim McFinnigan
Roger W. Morrissey
Mr. Vompatatat
Norman Fessler
Mailman (uncredited)
Danny Nero
Man in Street (uncredited)
Brian George
Sanjay (uncredited)
Boyd Banks
Waiter (uncredited)
Frank Welker
Nevins(voice)
