Jack Powell suffers from an affliction that makes him grow four times faster than normal, so the 10 year old boy looks like a 40 year old man. After years of being tutored at home, Jack convinces his overprotective parents to send him to public school. The children don't know what to make of Jack, but with the help of his fifth-grade teacher, he makes an effort to win them over.
Robin Williams
as Jack Powell
Diane Lane
as Karen Powell
Brian Kerwin
as Brian Powell
Jennifer Lopez
as Miss Marquez
Bill Cosby
as Lawrence Woodruff
Fran Drescher
as Dolores Durante
Adam Zolotin
as Louis Durante
Irwin Corey
as Poppy
Jurnee Smollett
as Phoebe
Ashlee Lauren
as Allison
Mario Yedidia
as George
Michael McKean
as Paulie
