In the 1960s, the BBC screened 253 episodes of its cult science fiction show Doctor Who, starring William Hartnell and then Patrick Troughton as the time traveling Doctor. Yet by 1975, the Corporation had wiped the master tapes of every single one of these episodes. Wiped! looks in detail at how the episodes came to be missing in the first place, and examines how material subsequently came to be returned to the BBC. This second edition updates the story with details of the recent episode discoveries from 'Galaxy 4' and 'The Underwater Menace,' as well as general updates, corrections and revisions throughout.