In the real world, the Space Fun Helmet was a children's toy released in 1976 made by Enco Industries. It came with a decal sticker sheet with the names "Kirk", "Spock", "McCoy", and "Scott", and the words "CREW", "Property of USS ENTERPRISE" and "Return to Ward Room." listed on the back of the helmet. Other than these details, the Space Fun Helmet had absolutely nothing to do with Star Trek whatsoever – that is, until its "official" appearance forty-fouryears later, in Star Trek: Lower Decks. 
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