Randy Quaid (Nick Laemle)
Mary Beth Hurt (Lily Laemle)
Sandy Dennis (Millie Dew)
Bryan Madorsky (Michael Laemle)
Juno Mills-Cockell (Sheila Zellner)
Warren Van Evera (Grandfather)
Mariah Balaban (Little Girl)
Wayne Robson (Lab Attendant)
Larry Palef (Announcer)
Helen Carscallen (Grandmother)
Uriel Byfield (Little Boy)
Kathryn Grody (Miss Baxter)
Deborah Rush (Mrs. Zellner)
Graham Jarvis (Mr. Zellner)