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In the conclusion of the four-part story "The Gunfighters," the Doctor (William Hartnell) and his companions Steven (Peter Purves) and Dodo (Jackie Lane) may very well meet their doom as the Earps and the Clantons shoot it out at the OK Corral in Tombstone, AZ. Complicating matters is Doc Holliday (Anthony Jacobs), who hasn't yet decided which side he will take in the climactic showdown. Written by Donald Cotton, "Johnny Ringo" was originally telecast on May 21, 1966. For the record, "The Gunfighters" was the last Doctor Who adventure to contain separately titled episodes.