Robin Williams
Alan Parrish
Kirsten Dunst
Judy
Bradley Pierce
Peter
Bonnie Hunt
Sarah
Jonathan Hyde
Van Pelt / Sam Parrish
Bebe Neuwirth
Nora
David Alan Grier
Bentley
Adam Hann-Byrd
Young Alan
Patricia Clarkson
Carol Parrish
Laura Bell Bundy
Young Sarah
James Handy
Exterminator
Gillian Barber
Mrs. Thomas
Brandon Obray
Benjamin
Cyrus Thiedeke
Caleb
Gary Joseph Thorup
Billy Jessup
Leonard Zola
Cop
Lloyd Berry
Bum
Malcolm Stewart
Jim Shepherd
Annabel Kershaw
Martha Shepherd
Darryl Henriques
Gun Salesman
Robyn Driscoll
Paramedic
Peter Bryant
Paramedic
Sarah Gilson
Girl
Florica Vlad
Girl
June Lion
Baker
Brenda Lockmuller
Pianist
Frederick Richardson
Barber
Frank Welker
Special Vocal Effects (voice)
Mike Mitchell
Mr. Williams' Stunt Double
Adam Bryant
Mr. Williams' Stand-In
Daniel Olsen
Ice Cream Man (uncredited)
David Szehi
Townie (uncredited)
Tom Woodruff Jr.
Lion / Crocodile (uncredited)