The additions to the cast to make up the "new" seven are Monte Markham, Bernie Casey, James Whitmore, Reni Santoni, Joe Don Baker and Scott Thomas.

[3]In late 19th century Mexico, Federales capture Quintero (Fernando Rey), a revolutionary who attempts to rally those opposing the dictatorship of President Díaz.

Bandit chief Carlos Lobero (Frank Silvera) demands that the money be used for guns and ammunition, but Max instead crosses the border in search of Chris Adams (George Kennedy): a legendary, American gunman whom his cousin had told him about.

Chris agrees to mount a rescue of Quintero and uses $500 of Max's money to recruit five highly trained combatants: Keno (Monte Markham), a horse thief and hand-to-hand combat expert (whom Chris saved from hanging); Cassie (Bernie Casey), a brawny but intelligent former slave, who can handle dynamite; Slater (Joe Don Baker), a one-armed, sideshow sharp-shootist; a tubercular wrangler called "P.J."

(Scott Thomas), and Levi Morgan (James Whitmore), an aging family man who is doubtful of his worth, despite his incredible knife-throwing skills.

Their journey is marked by encounters with a political prisoner's little boy, Emiliano Zapata (Tony Davis) and a pretty peasant girl, Tina (Wende Wagner), who falls in love with P.J.

[3] Mirisch surrounded Kennedy with a strong cast, with Monte Markham giving a thinly-disguised Steve McQueen-like performance, in the same wardrobe McQueen wore in The Magnificent Seven.

In his review for The New York Times, Howard Thompson noted the film suffered from poor production values, and a derivative plot, "It's the same old iron-jawed, cowboy seven, with new actors and all the magnificence of a dead burro.