Julius and Vincent Benedict are the results of an experiment that would allow for the perfect child. Julius was planned and grows to athletic proportions. Vincent is an accident and is somewhat smaller in stature. Vincent is placed in an orphanage while Julius is taken to a south seas island and raised by philosophers. Vincent becomes the ultimate low life and is about to be killed by loan sharks.
| Production | Ivan Reitman | Producer |
| Production | Michael C. Gross | Executive Producer |
| Production | Joe Medjuck | Executive Producer |
| Camera | Andrzej Bartkowiak | Director of Photography |
| Editing | Donn Cambern | Editor |
| Editing | Sheldon Kahn | Editor |
| Directing | Ivan Reitman | Director |
| Writing | William Davies | Screenplay |
| Writing | William Osborne | Screenplay |
| Writing | Timothy Harris | Screenplay |
| Writing | Herschel Weingrod | Screenplay |
| Art | James D. Bissell | Production Design |
| Production | Michael Chinich | Casting |
| Sound | Georges Delerue | Original Music Composer |
| Sound | Randy Edelman | Original Music Composer |
| Art | Christopher Burian-Mohr | Art Direction |
| Art | John T. Walker | Set Decoration |
| Costume & Make-Up | Gloria Gresham | Costume Design |
| Production | Sheldon Kahn | Associate Producer |
| Production | Gordon A. Webb | Associate Producer |
| Costume & Make-Up | Judith A. Cory | Hairstylist |
| Costume & Make-Up | Leonard Engelman | Makeup Artist |
| Costume & Make-Up | Katherine Kotarakos | Makeup Artist |
| Costume & Make-Up | Robert Ostermann | Hairstylist |
| Costume & Make-Up | Peggy Semtob | Hairstylist |
| Costume & Make-Up | Peter Tothpal | Hairstylist |
| Production | Gordon A. Webb | Unit Production Manager |
| Directing | Peter Giuliano | First Assistant Director |
| Directing | Ira S. Rosenstein | Second Second Assistant Director |
| Directing | Barry K. Thomas | Second Assistant Director |
| Directing | Linnea Ebba Wicklund | Second Second Assistant Director |
| Crew | Bobby Bass | Stunts |
| Crew | Steve Boyum | Stunts |
| Editing | Debra Bard | Assistant Editor |
| Sound | Peter Afterman | Music Supervisor |
| Directing | Wilma Garscadden-Gahret | Script Supervisor |
| Production | William Goldman | Script Researcher |
| Crew | Stephanie Epper | Stunts |
| Crew | Debbie Evans | Stunt Driver |
| Crew | Donna Garrett | Stunts |
| Crew | Sandra Lee Gimpel | Stunts |
| Crew | Marguerite Happy | Stunts |
| Crew | Joel Kramer | Stunt Coordinator |
| Crew | Joel Kramer | Stunt Double |
| Crew | Peter Kent | Stunt Double |
| Crew | Nick Dimitri | Stunts |
| Art | Nancy Patton | Set Designer |
| Art | William James Teegarden | Set Designer |
| Art | Ed Verreaux | Set Designer |
| Art | Gordon Meloeny | Set Dresser |
| Art | Robert G. Santarella | Set Dresser |
| Art | Bryan D. Garofalo | Set Dresser |
| Art | Steven Lee Baer | Set Dresser |
| Camera | Dustin Blauvelt | Camera Operator |
| Camera | Toby Phillips | Steadicam Operator |
| Camera | Bruce McBroom | Still Photographer |
| Sound | Gene S. Cantamessa | Sound Mixer |
| Sound | Steve Cantamessa | Boom Operator |
| Crew | Mark Jennings | Cableman |
| Costume & Make-Up | Jeff Dawn | Makeup Artist |
| Costume & Make-Up | Adrienne Manhan | Costumer |
| Art | Bill MacSems | Property Master |
| Art | Stuart Watnick | Assistant Property Master |
| Art | Hope M. Parrish | Assistant Property Master |
| Art | Tom Miller | Assistant Property Master |
| Production | Pamela Cederquist | Production Coordinator |
| Production | Pamela Easley | Production Coordinator |
| Production | Ellen Adolph | Production Accountant |
| Production | Stuart Fink | Publicist |
| Production | Dorothy O'Leary | Casting Assistant |
| Sound | Tom McCarthy Jr. | Supervising Sound Editor |
| Sound | Fred Judkins | Supervising Sound Editor |
| Sound | Richard Friedman | Supervising ADR Editor |
| Sound | Joe Gilbert | ADR Editor |
| Sound | David M. Ice | Sound Effects Editor |
| Sound | Don S. Walden | Sound Effects Editor |
| Sound | Mary Ruth Smith | Sound Effects Editor |
| Sound | Mark Gordon | Sound Effects Editor |
| Sound | Jeff Rosen | Sound Effects Editor |
| Sound | Edward Rossi | Sound Effects Editor |
| Sound | David Williams | Sound Effects Editor |
| Sound | William Hartman | Sound Effects Editor |
| Crew | Tom Buffum | Special Sound Effects |
| Sound | Diane DeLouise Wessel | Assistant Music Supervisor |
| Editing | Dawn Solér | Project Manager |
| Sound | Frank Fitzpatrick | Supervising Music Editor |
| Editing | Jeffrey James Bell | Assistant Editor |
| Editing | Saul Saladow | Assistant Editor |
| Crew | Paula Tracy-Smuin | Choreographer |
| Lighting | Chris Strong | Gaffer |
| Lighting | R. Michael De Chellis | Rigging Gaffer |
| Lighting | Curt Marthey | Electrician |
| Lighting | Rick A. Benedetto | Electrician |
| Camera | Cary Griffith | Key Grip |
| Camera | Hank Sheppherd | Second Company Grip |
| Camera | Khan Griffith | Grip |
| Camera | Rodney Veto | Grip |
| Camera | Phillip R. Sarabia | Grip |
| Camera | William Kenney | Dolly Grip |
| Crew | Michael Lantieri | Special Effects Coordinator |
| Art | Ernie Depew | Construction Coordinator |
| Art | Eero Hautanen | Construction Foreman |
| Art | Mike Litteken | Construction Foreman |
| Art | Francis N. 'Lucky' Costello | Standby Painter |
| Crew | David Marder | Transportation Coordinator |
| Crew | John Feinblatt | Transportation Captain |
| Crew | Marlo Hellerstein | Transportation Captain |
| Production | Frank Davis | Production Assistant |
| Production | Kris Krengel | Production Assistant |
| Production | Michael Neuman | Production Assistant |
| Production | Dylan Gross | Production Assistant |
| Production | Stephanie Kahn | Production Assistant |
| Production | Christine Cramer | Production Assistant |
| Editing | Donah Bassett | Negative Cutter |
| Editing | Bob Hagans | Color Timer |
| Editing | Reid Burns | Color Timer |
| Crew | Jerry Brutsche | Stunts |
| Crew | Buzz Bundy | Stunts |
| Crew | Vince Deadrick Jr. | Stunts |
| Crew | Richard Drown | Stunts |
| Crew | Jophery C. Brown | Stunts |
| Crew | Debbie Evans | Stunts |
| Crew | Roy E. Harrison | Stunts |
| Crew | A. Michael Lerner | Stunts |
| Crew | David Perna | Stunts |
| Crew | Walter Robles | Stunts |
| Crew | R.A. Rondell | Stunts |
| Crew | Frank James Sparks | Stunts |
| Crew | Steven Lambert | Stunts |
| Crew | Michael M. Vendrell | Stunts |
| Crew | Erik Cord | Stunts |
| Crew | Amber Alexander | Stunts |
| Crew | Lane Leavitt | Stunts |
