Two brothers, Bull and Jonathan Bullivan, witness the murder of bandit Black Boy who had been terrorizing Golden City. The bandit had been put in place by the city mayor, who wants the local residents to leave so that he can keep their land, where there is oil. The two brothers eat a chicken that has been fed with a strong tonic and they become sort of invincible for a few minutes. The mayor, pressured by the villagers, appoints the Bullivan Brothers as sheriffs and tasks them with the arrest of Black Boy.
| Directing | Antonio Momplet | Director |
| Directing | Alberto De Martino | Director |
| Production | Emo Bistolfi | Producer |
| Camera | Dario Di Palma | Director of Photography |
| Camera | Ricardo Torres | Director of Photography |
| Editing | Otello Colangeli | Editor |
| Art | Franco Lolli | Production Design |
| Costume & Make-Up | Romolo De Martino | Makeup Artist |
| Camera | Alberto Spagnoli | Camera Operator |
| Writing | Mario Guerra | Story |
| Writing | Mario Guerra | Screenplay |
| Writing | Vittorio Vighi | Story |
| Writing | Vittorio Vighi | Screenplay |
| Writing | Giulio Scarnicci | Co-Writer |
| Writing | Renzo Tarabusi | Co-Writer |
| Production | Alberto Giommarelli | Unit Manager |
| Production | Torquato Carocci | Production Secretary |
| Production | Rodolfo Mecacci | Production Secretary |
| Directing | Adriana Ronco | Script Supervisor |
| Costume & Make-Up | Umberto De Martino | Assistant Makeup Artist |
| Costume & Make-Up | Luciana Blengini | Hairstylist |
| Camera | Antonio Annunziata | Assistant Camera |
| Sound | Mario Ottavi | Boom Operator |
| Costume & Make-Up | Angiolina Menichelli | Costume Design |
| Sound | Luigi Puri | Sound |
| Sound | Franco Pisano | Original Music Composer |
| Production | Divo Cavicchioli | Line Producer |
| Production | Renato Tonini | Production Manager |