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Out of the Unknown was a British sci-fi anthology series that aired from 1967-1971 that was produced by BBC and aired on BBC2 in four series. During the early 1970s, a number of episodes were wiped in order to cut costs in buying new tapes to record with. A total of 49 episodes were produced and aired on BBC2, however only 20 of these episodes still exist in their entirety. There are a few episodes that have small video clips existing, along with complete audio recordings of episodes, along with small audio clips without video of lost episodes. Off-screen photographs, known as tele-snaps, were taken of many first and second series stories including some of the missing episodes. All of the surviving episodes were released on DVD in November of 2014 by BFI.