Famous Western actor Robert Mitchum’s role in Tombstone was changed after he sustained an injury and could no longer appear in the film. Tombstone‘s cast went through a few changes but ultimately starred Kurt Russell as the lawman Wyatt Earp and Val Kilmer as his associate Doc Holiday. The film explores the real 1880s people and old-west Arizona events, including the OK Corral Gunfight, and is considered a classic of the genre.