Robin Williams
Professor Philip Brainard
Marcia Gay Harden
Dr. Sara Jean Reynolds
Christopher McDonald
Wilson Croft
Raymond J. Barry
Chester Hoenicker
Clancy Brown
Smith
Nancy Olson
Secretary at Ford Motor Company
Ted Levine
Wesson
Wil Wheaton
Bennett Hoenicker
Edie McClurg
Martha George
Jodi Benson
Weebo (voice)
Leslie Stefanson
Sylvia
M
Malcolm Brownson
Father
B
Benjamin Brock
Window Boy
Dakin Matthews
Minister
Z
Zack Zeigler
Teenage Boy
Sam Lloyd
Coach Willy Barker
Scott Martin Gershin
Flubber (voice)
Julie Morrison
Weebette (voice)
B
Bob Sarlatte
Rutland Coach
Scott Michael Campbell
Dale Jepner
B
Bob Greene
Referee
T
Tom Barlow
Medfield Basketball Player