An oppressed Mexican peasant village hires seven gunfighters to help defend their homes.

Marshal Chris Adams turns down a friend's request to help stop the depredations of a gang of Mexican bandits. When his wife is killed by bank robbers and his friend is killed capturing the last thief, Chris feels obligated to take up his friend's cause and recruits a writer and five prisoners to destroy the desperadoes.The last in the original series of four "Magnificent Seven" movies.

Chico one of the remaining members of The Magnificent Seven now lives in the town that they (The Seven) helped. One day someone comes and takes most of the men prisoner. His wife seeks out Chris, the leader of The Seven for help. Chris also meets Vin another member of The Seven. They find four other men and they go to help Chico.

In this third remake of legendary Japanese director Akira Kurosawa's hugely influential The Seven Samurai, the seven gunslingers (George Kennedy, Michael Ansara, Joe Don Baker, Bernie Casey, Monte Markham, Fernando Rey and Reni Santoni) liberate Mexican political prisoners, train them as fighters and assist them in a desperate attack on a Mexican fortress in an attempt to free a revolutionary leader.