An experiment on a simpleton turns him into a genius. When he discovers what has been done to him he struggles with whether or not what was done to him was right.
| Directing | Ralph Nelson | Director |
| Writing | Stirling Silliphant | Screenplay |
| Writing | Daniel Keyes | Novel |
| Production | Ralph Nelson | Producer |
| Production | Selig J. Seligman | Executive Producer |
| Sound | Ravi Shankar | Music |
| Camera | Arthur J. Ornitz | Director of Photography |
| Editing | Fredric Steinkamp | Editor |
| Art | John DeCuir | Production Design |
| Art | Charles Rosen | Art Direction |
| Costume & Make-Up | Hazel Roy | Costume Design |
| Costume & Make-Up | Vin Kehoe | Makeup Artist |
| Costume & Make-Up | Phil Naso | Hairstylist |
| Production | Henry Spitz | Production Manager |
| Production | Tom Walker Jr. | Production Supervisor |
| Crew | Shelley Bartolini | Scenic Artist |
| Sound | Clem Portman | Recording Supervision |
| Sound | Jim Shields | Sound Recordist |
| Camera | Jack Brown | Assistant Camera |
| Crew | Rod Stephens | Post Production Assistant |
| Art | Richard Kuhn | Title Designer |
