DOCTOR: Of course, of course. RINGO: The only man in the territory low enough to kill an unarmed barman is Doc Holliday.
Plan: A: Tombstone; Q: Where did the First Doctor find himself involved with gunmen? A: the First Doctor; Q: Who finds himself involved with gunmen out to kill Doc Holliday? Summary: Arriving in the town of Tombstone, the First Doctor finds himself involved with gunmen out to kill Doc Holliday...