The opening moments immediately signal trouble, beginning with a remarkably poor theme song that can't manage to find a rhyme for “have a go” and “Shalako,” setting a tone more akin to vandalism than quality writing. A collection of performers past their prime are brought together to portray a hunting expedition set in the American West near the close of the 1800s. They’re under the direction of the "Baron" (Peter Van Eyck), accompanied by the alluring "Irina" (Brigitte Bardot), the irritable "Daggett" (Jack Hawkins) and his wife, and are being led astray by the deceitful "Fulton" (Stephen Boyd, who seems lifted directly from “Genghis Khan” of 1965). Their need for Fulton’s guidance stems from the fact that they're trespassing in Apache land, and those inhabitants aren't happy about outsiders showing up dressed formally and enjoying luxuries while routinely killing animals for amusement (thanks to Eric Sykes). During their journey, this odd assortment meets the mysterious "Shalako" (Sean Connery), who possesses a past connection with the local people that proves useful when they are attacked. Fulton then quickly abandons them, taking their guides, transportation, and most of their supplies. This triggers a grueling struggle that endangers the group and predictably provides opportunities for each of these rather dull characters to reveal personal flaws and have brief moments in the spotlight—and this is where the film truly falls apart. Hawkins and Van Eyck are especially poor performers; Blackman attempts some wry humor, but Bardot would have been better off staying with her animals, and Connery seems unable to grasp his character as this overwrought and uninspired drama stumbles toward its foreseeable ending. It’s difficult to understand why anyone sanctioned the production of this film, because there's very little about it that makes it worthwhile.

Source on TMDB