A group of young gunmen, led by Billy the Kid, become deputies to avenge the murder of the rancher who became their benefactor. But when Billy takes their authority too far, they become the hunted.
In 1950, attorney Charles Phalen is contacted by an elderly man named "Brushy Bill" Roberts. Brushy Bill tells Phalen that he is dying and wants to receive a pardon that he was promised 70 years before by the Governor of New Mexico Territory, claiming that he is really William H. Bonney aka "Billy The Kid", whom "everyone" knows to have been shot and killed by Pat Garrett in 1881. Phalen then asks if Bill has any proof that he is the famous outlaw.