| Dustin Hoffman | Raymond 'Ray' Babbitt |
| Tom Cruise | Charles Sanford 'Charlie' Babbitt |
| Valeria Golino | Susanna |
| Jerry Molden | Dr. Bruner |
| Jack Murdock | John Mooney, Will Executor |
| Michael D. Roberts | Vern |
| Ralph Seymour | Lenny |
| Lucinda Jenney | Iris |
| Bonnie Hunt | Sally Dibbs, Diner Waitress |
A wheeler-dealer meets his brother, an institutionalized autistic-savant, heir to $3 million.
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