Watch “Shadowbox – lost TV Intro“.
“The lost intro to ‘Shadowbox’ the forgotten 1970s TV show which traumatised a generation. Now considered a Hauntological artefact. original copies are scarce and said to be truly something to be handled with care.”
(n.b. this “recovered” video is a modern found footage thingy, and not an actual historic show; at least, not until someone makes the series for real?)