LOS ANGELES — Before the sci-fi series “Stranger Things” premiered on Netflix, several traditional studios already had passed on it. Its creators were first-time show runners, unknown young actors were cast in lead roles, and even though the show starred kids, it was not for children.

That was nine years ago.

The 1980s-set show about a monster that wreaks havoc on fictional Hawkins, Ind., hit a chord with Netflix’s global subscribers. “Stranger Things” has since become one of the streamer’s most culturally significant shows, with its fourth season garnering 140.7 million views in its first three months and ranking third among its top English-language series. It was instrumental in growing new branches of business for Netflix, including live events and a Broadway production, and it inspir

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