[1] Jim Brown and Lee Van Cleef lead a band of Apaches (including Iron Eyes Cody) against a fortress commanded by Patrick O'Neal.

The movie was shot in 35mm Technicolor in Almería, Spain, and involved the construction of the huge adobe fortress set that was re-used in later films, including Conan the Barbarian (1982) and March or Die (1977).

[3] [4] The studio had recently made a film called Daddy's Gone A-Hunting based on a script by Larry Cohen.

[9] Cohen says that director John Guillermin and producer Andre de Toth did not get along, in part because the latter wanted to direct.

Roger Ebert of the Chicago Sun-Times gave El Condor a negative review, giving it one-and-a-half stars out of four.

Ebert declared that "what El Condor lacks in intelligence, it makes up for in stupidity" and opined that the film contained nothing but cynical violence.