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- John Lithgow as George Henderson
- Melinda Dillon as Nancy Henderson
- Margaret Langrick as Sarah Henderson
- Joshua Rudoy as Ernie Henderson
- Kevin Peter Hall as Harry
- Rick Baker as Harry (puppeteer)
- Tom Hester as Harry (puppeteer)
- Tim Lawrence as Harry (puppeteer)
- Fred Newman as Harry (voice)
- Lainie Kazan as Irene Moffat
- Don Ameche as Dr. Wallace Wrightwood
- David Suchet as Jacques LaFleur
- M. Emmet Walsh as George Henderson Sr.
- William Dear as Sighting Man