 Of the 253 episodes of "Doctor Who" that were produced in the 1960s,  108 no longer exist in the BBC Television Archives due to an archive  purge in the 1970s. The most recent episode to be recovered as of  2006 is a print of the 1965 episode "The Daleks Master Plan: Day of  Armageddon", returned by a former BBC engineer in January 2004.