Als Julius hoort dat hij een tweelingbroer heeft, neemt hij het eerste vliegtuig naar Californië. Daar ontmoet hij Vincent, zijn tweelingbroer. De twee zijn totaal verschillend: Julius is de goedheid zelve, terwijl Vincent steelt en continu op de vlucht is voor de maffia. Samen besluiten ze op zoek te gaan naar de waarheid achter hun verleden.
| Directing | Ivan Reitman | Director |
| Camera | Andrzej Bartkowiak | Director of Photography |
| Editing | Donn Cambern | Editor |
| Writing | William Osborne | Screenplay |
| Writing | Timothy Harris | Screenplay |
| Production | Ivan Reitman | Producer |
| Editing | Sheldon Kahn | Editor |
| Writing | William Davies | Screenplay |
| Production | Michael C. Gross | Executive Producer |
| Production | Joe Medjuck | Executive Producer |
| Writing | Herschel Weingrod | Screenplay |
| Crew | Lane Leavitt | Stunts |
| Art | James D. Bissell | Production Design |
| Sound | Georges Delerue | Original Music Composer |
| Production | Michael Chinich | Casting |
| Costume & Make-Up | Gloria Gresham | Costume Design |
| Sound | Randy Edelman | Original Music Composer |
| Art | John T. Walker | Set Decoration |
| Art | Christopher Burian-Mohr | Art Direction |
| Costume & Make-Up | Robert Ostermann | Hairstylist |
| Directing | Peter Giuliano | First Assistant Director |
| Production | Gordon A. Webb | Associate Producer |
| Sound | Peter Afterman | Music Supervisor |
| Crew | Steve Boyum | Stunts |
| Production | Gordon A. Webb | Unit Production Manager |
| Crew | Bobby Bass | Stunts |
| Editing | Debra Bard | Assistant Editor |
| Directing | Wilma Garscadden-Gahret | Script Supervisor |
| Directing | Barry K. Thomas | Second Assistant Director |
| Directing | Linnea Ebba Wicklund | Second Second Assistant Director |
| Costume & Make-Up | Peter Tothpal | Hairstylist |
| Directing | Ira S. Rosenstein | Second Second Assistant Director |
| Production | William Goldman | Script Researcher |
| Costume & Make-Up | Leonard Engelman | Makeup Artist |
| Production | Sheldon Kahn | Associate Producer |
| Costume & Make-Up | Judith A. Cory | Hairstylist |
| Costume & Make-Up | Katherine Kotarakos | Makeup Artist |
| Costume & Make-Up | Peggy Semtob | Hairstylist |
| Crew | Joel Kramer | Stunt Coordinator |
| Crew | Debbie Evans | Stunt Driver |
| Crew | Joel Kramer | Stunt Double |
| Crew | Stephanie Epper | Stunts |
| Crew | Marguerite Happy | Stunts |
| Crew | Sandra Lee Gimpel | Stunts |
| Crew | Peter Kent | Stunt Double |
| Crew | Donna Garrett | Stunts |
| Crew | Nick Dimitri | Stunts |
| Camera | Dustin Blauvelt | Camera Operator |
| Camera | Toby Phillips | Steadicam Operator |
| Camera | Bruce McBroom | Still Photographer |
| Art | Steven Lee Baer | Set Dresser |
| Art | Stuart Watnick | Assistant Property Master |
| Art | Ed Verreaux | Set Designer |
| Costume & Make-Up | Jeff Dawn | Makeup Artist |
| Art | Bill MacSems | Property Master |
| Art | Robert G. Santarella | Set Dresser |
| Production | Pamela Cederquist | Production Coordinator |
| Sound | Steve Cantamessa | Boom Operator |
| Costume & Make-Up | Adrienne Manhan | Costumer |
| Art | Gordon Meloeny | Set Dresser |
| Art | Bryan D. Garofalo | Set Dresser |
| Production | Pamela Easley | Production Coordinator |
| Art | Nancy Patton | Set Designer |
| Art | Hope M. Parrish | Assistant Property Master |
| Art | William James Teegarden | Set Designer |
| Production | Ellen Adolph | Production Accountant |
| Crew | Mark Jennings | Cableman |
| Sound | Gene S. Cantamessa | Sound Mixer |
| Art | Tom Miller | Assistant Property Master |
| Production | Stuart Fink | Publicist |
| Sound | Don S. Walden | Sound Effects Editor |
| Production | Dorothy O'Leary | Casting Assistant |
| Sound | Edward Rossi | Sound Effects Editor |
| Sound | William Hartman | Sound Effects Editor |
| Sound | Fred Judkins | Supervising Sound Editor |
| Sound | Joe Gilbert | ADR Editor |
| Sound | Jeff Rosen | Sound Effects Editor |
| Sound | David Williams | Sound Effects Editor |
| Sound | Mark Gordon | Sound Effects Editor |
| Sound | Mary Ruth Smith | Sound Effects Editor |
| Sound | Richard Friedman | Supervising ADR Editor |
| Sound | Tom McCarthy Jr. | Supervising Sound Editor |
| Sound | David M. Ice | Sound Effects Editor |
| Crew | Tom Buffum | Special Sound Effects |
| Editing | Saul Saladow | Assistant Editor |
| Lighting | Rick A. Benedetto | Electrician |
| Camera | Hank Sheppherd | Second Company Grip |
| Camera | William Kenney | Dolly Grip |
| Art | Eero Hautanen | Construction Foreman |
| Crew | Marlo Hellerstein | Transportation Captain |
| Art | Francis N. 'Lucky' Costello | Standby Painter |
| Production | Dylan Gross | Production Assistant |
| Art | Ernie Depew | Construction Coordinator |
| Crew | David Marder | Transportation Coordinator |
| Sound | Frank Fitzpatrick | Supervising Music Editor |
| Crew | Paula Tracy-Smuin | Choreographer |
| Lighting | Chris Strong | Gaffer |
| Editing | Jeffrey James Bell | Assistant Editor |
| Camera | Cary Griffith | Key Grip |
| Camera | Rodney Veto | Grip |
| Crew | John Feinblatt | Transportation Captain |
| Production | Frank Davis | Production Assistant |
| Editing | Dawn Solér | Project Manager |
| Camera | Phillip R. Sarabia | Grip |
| Lighting | Curt Marthey | Electrician |
| Crew | Michael Lantieri | Special Effects Coordinator |
| Lighting | R. Michael De Chellis | Rigging Gaffer |
| Art | Mike Litteken | Construction Foreman |
| Sound | Diane DeLouise Wessel | Assistant Music Supervisor |
| Camera | Khan Griffith | Grip |
| Production | Stephanie Kahn | Production Assistant |
| Crew | Michael M. Vendrell | Stunts |
| Production | Michael Neuman | Production Assistant |
| Editing | Bob Hagans | Color Timer |
| Editing | Reid Burns | Color Timer |
| Crew | Jerry Brutsche | Stunts |
| Crew | Debbie Evans | Stunts |
| Crew | Walter Robles | Stunts |
| Crew | Erik Cord | Stunts |
| Crew | David Perna | Stunts |
| Crew | Frank James Sparks | Stunts |
| Crew | Roy E. Harrison | Stunts |
| Production | Kris Krengel | Production Assistant |
| Editing | Donah Bassett | Negative Cutter |
| Crew | R.A. Rondell | Stunts |
| Crew | Jophery C. Brown | Stunts |
| Crew | Richard Drown | Stunts |
| Crew | Amber Alexander | Stunts |
| Production | Christine Cramer | Production Assistant |
| Crew | Buzz Bundy | Stunts |
| Crew | Vince Deadrick Jr. | Stunts |
| Crew | A. Michael Lerner | Stunts |
| Crew | Steven Lambert | Stunts |
