Trivia: For the first three seasons of Doctor Who, each individual episode had a title, as well as an "umbrella" title for the whole story (like the titles of chapters in a book). This has caused much confusion over the years. For example, the story "100,000 BC" is the title of the first Doctor Who story, but this story is also widely known as "An Unearthly Child" after the title of the first episode. By the time of "The Gunfighters" (first broadcast in May 1966) this source of confusion was realised, and the practice ceased. From 28th May 1966, each Doctor Who story had just the "umbrella" title, followed by "Part One" "Part Two" and so on.