June 19, 1882 - Outlaw Ed Mace is passing through Tombstone when he kills two men in a saloon, one of those being Clay Hollister's deputy. Mace leaves town headed for Durango where he intends to kill Doc Holliday. Mace is looking for revenge for his bother's death back in Texas. Sheriff Hollister, having been deputized as a US Marshal, goes after Mace and his gang.