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.
Walter Chiari
Raimondo Vianello
Aroldo Tieri
Licia Calderón
María Silva
Antonio Molino Rojo
Félix Fernández
Bruno Scipioni
Emilio Rodríguez
Claude Marchand
José Calvo
Miguel del Castillo
Alfonso Rojas
Fernando Hilbeck
Rafael Luis Calvo
Antonio Vico
Mac Ronay
Román Ariznavarreta
Agustín Bescos
Xan das Bolas
Juan Cazalilla
Belinda Corel
Pedro Fenollar
Venancio Muro
Antonio Padilla
María Pinar
Ángela Pla
José Riesgo
Maruja Tamayo
José Villasante