Black Museum is the conclusion to Black Mirror's fourth season. It's an hour-long episode with several short stories entwined within the central plot of the episode.
Detailing the various technologies used in previous episodes--that typically had not-so-great outcomes--Black Museum is owned by a former neuroscientist with a dark past that spans throughout his lifetime; each telling a tale of one person suffering as a result of his creations, of which he assumed were a step forward in technology and science.
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A little trivia: Black Museum is a real museum in London that shows various items from London's criminal history.
**The Black Museum is found in a remote part of the country, deep within desert and dust, and is stumbled across by a lone female that holds a curious interest in its history, as well as the owner's. Although, she isn't there to make friends and learn of the museum's cruel past; she's there for revenge, for she is the daughter of one of his cruel tests.
Given this episode focuses mostly on the owner's past and his former creations--which are found within the museum itself--it tells multiple stories of his creations, and how they came to be. We see people's 'souls' placed into teddy bears; people going crazy with technology that allows one to feel the pain of another without suffering from the physical complications as well; in addition to a highly inhumane manipulation of a male on death row, leading to a digital version of him experiencing nothing but pain and suffering within the museum as a result of the various visitors treating his execution like a game with a souvenir prize.
It's a truly dark episode, and probably the most depressing one of the season. Black Museum genuinely feels like it belongs in Black Mirror, and it was a nice ending for the season. I'd be happy if this was the episode in which Black Mirror entirely ended on; it feels like closure, and redeems its relatively average former episodes.