Alan Arkin
Simon Mendelssohn
Madeline Kahn
Dr. Cynthia Mallory
Wallace Shawn
Eric Van Dongen
Max Wright
Leon Hundertwasser
Fred Gwynne
Maj. Gen. Korey
Austin Pendleton
Dr. Carl Becker
Adolph Green
Commune Leader
Billie Perkins
Commune Member
Pierre Epstein
Military Aide
David Gideon
Security Guard
Hetty Galen
Simon's Mother (voice)
Remak Ramsay
TV Newscaster
Hansford Rowe
Priest Babcock Beastly
Yusef Bulos
Hemling Grotowsky
Jerry Mayer
Prof. Jerry Milstein
Sol Frieder
Rabbi Chaim Glassberg
Frank J. Lucas
Psychologist
George Riddle
Muttonchop Aide
Tom Kubiak
Roach Reaction Patient
Al Cerullo
Helicopter Pilot
Barbara Mongin
Institute Staff Member
James Dukas
Narrator (voice)
Michael Earl
Commune Member
Steven Nash
Commune Member
Barbara Bergen
Commune Member
Joyce Adams
Commune Member
Bonnie Deroski
Commune Member
Kathryn Cordes
Commune Member
Leslie Frances Williams
Commune Member
Nick Pippin
Commune Member
Ed Karvoski
Commune Member
Mary Lou Kleinbach
Commune Member
Richard Bassett
Commune Member
Isam Culver
Commune Member
Rickey Murray
Commune Member
Stephanie Segal
Commune Member
Mary Donnet
Commune Member
Nikki Kollins
Commune Member
Jenny Gault
Commune Member
Regina Rodwell
Commune Member
Schorling Schneider
Commune Member
Tina Austin
Commune Member
Jeffrey Bacon
Commune Member
Elizabeth Wingate
Commune Member
Lisa Maurer
Commune Member
Louise Lasser
Doris (voice) (uncredited)