Cultured Mario and outlaw Lucien, twins separated at birth, join forces to avenge their parents' death at the hands of evil Colonna. Because each feels all the same sensations experienced by the other, swordplay is difficult for them. Worse yet, raised very differently, they struggle to find common ground between their conflicting personalities. But to defeat their enemy, the two will have to overcome the obstacles and work as a team.
| Directing | Gregory Ratoff | Director |
| Writing | George Bruce | Screenplay |
| Writing | Alexandre Dumas | Novel |
| Sound | Dimitri Tiomkin | Original Music Composer |
| Costume & Make-Up | Walter Plunkett | Costume Design |
| Crew | Howard A. Anderson | Special Effects |
| Production | Edward Small | Producer |
| Camera | Harry Stradling Sr. | Director of Photography |
| Writing | George Bruce | Adaptation |
| Writing | Howard Estabrook | Adaptation |
| Editing | William F. Claxton | Editor |
| Directing | Sam Nelson | Assistant Director |
| Sound | Truman K. Wood | Sound Effects Editor |
| Crew | Ralph Faulkner | Fight Choreographer |
| Art | Nicolai Remisoff | Art Direction |
| Editing | Grant Whytock | Supervising Editor |
| Art | Nicolai Remisoff | Production Design |
| Art | Edward G. Boyle | Set Decoration |
| Production | Max Golden | Production Manager |
| Sound | Earl Sitar | Sound |
| Crew | David Sharpe | Stunts |
| Sound | Joseph Nussbaum | Orchestrator |
| Crew | Adolph Bolm | Choreographer |
| Costume & Make-Up | Don L. Cash | Makeup Artist |
| Production | Grant Whytock | Producer's Assistant |
