The love of his life gunned down by the ruthless Kennedy brothers, legendary Old West lawman Wyatt Earp forms a posse that includes Doc Holliday, Bat Masterson, Charlie Bassett, and Bill Tilghman to track down the vicious outlaws, and avenge her murder. Meanwhile, in order to get to the Kennedy brothers, Earp and his men will first have to go through their notorious father, a powerful man who isn't about to go down without a fight.