[1] Two of the episodes, "A Distant Scream" and "In Possession", were remakes of stories that had been made for the fourth season of the BBC anthology series Out of the Unknown, originally titled "The Last Witness" and "The Uninvited".

The master videotapes for both of the original teleplays were wiped by the corporation during the 1970s and no copies are known to exist, leaving only still photographs, a short video clip of "The Last Witness" and a complete audio recording of "The Uninvited" surviving.

"A Distant Scream" and "In Possession" are effectively the only way these two stories can be viewed in a full audio-visual format.

In Germany, a four-DVD set was released in March 2018 under the title Vorsicht, Hochspannung!, which has 11 "main feature" episodes with a choice of either dubbed German language audio or the original English language audio, along with 2 "bonus episodes" with just the original English language audio.

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