On screen
Cast
22 credited performers
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
Artwork unavailable
Malcolm Brownson
Father
Artwork unavailable
Benjamin Brock
Window Boy
Dakin Matthews
Minister
Artwork unavailable
Zack Zeigler
Teenage Boy
Sam Lloyd
Coach Willy Barker
Scott Martin Gershin
Flubber (voice)
Julie Morrison
Weebette (voice)
Artwork unavailable
Bob Sarlatte
Rutland Coach
Scott Michael Campbell
Dale Jepner
Artwork unavailable
Bob Greene
Referee
Artwork unavailable
Tom Barlow
Medfield Basketball Player