Disputed story titles are overwhelmingly found in Hartnell era serials. Until The Savages — late into his career as the First Doctor — stories were broadcast not under a serial title, but rather as a series of individually-titled episodes. Thus, when there eventually arose a need to talk of these stories in the context of later serials which only had serial title, they had to be given a retroactive serial title they had never publicly had before. Two particular impetuses for this process were the publications of the first lists of serials, such as The Doctor Who Programme Guide, and the initial BBC Enterprises release of the serials to home video.