| Greg Kinnear | Paul Duncan |
| Rebecca Romijn-Stamos | Jessie Duncan |
| Robert De Niro | Dr. Richard Wells |
| Cameron Bright | Adam Duncan |
| Marcia Bennett | Principal Hersch |
| Zoie Palmer | Susan Pierce |
| Janet Bailey | Cora Williams |
| Devon Bostick | Zachary Clark Wells |
| Jenny Levine | Sandra Shaw |
| Deborah Odell | Tanya |
A scientist clones a couple's dead son, but the boy behaves strangely after his eighth birthday.
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