Arizona, 1881. A stagecoach robbery with international consequences leads to a showdown between the Earp brothers and the Clanton-McLaury Cowboys.

In the wake of the gunfight, a disgraced Ike Clanton attempts to sway public opinion by branding the Earps and Doc Holliday as cold-blooded killers.

After a major courtroom defeat, the Cowboys hatch a plan to ambush Tombstone and regain power. A shocking murder pushes Wyatt over the edge.

Lacking faith in the Arizona legal system, Wyatt takes the law into his own hands and embarks on a headline-making vigilante crusade against Ike Clanton.

As Tombstone's murder rate skyrockets, Wyatt and Ike bolster their ranks in preparation for a final clash. The White House takes steps to restore peace.