Initially when Matt and Ross Duffer’s two parents signed a contract with Netflix, they thought they could only get one season. Even under the initial scenario, Eleven (Millie Bobby Brown) will die at the end of the season 1. Finally, due to the overly public reception, the two decided to make a long-term plan for Stranger Things. And maybe, in that plan, there was a season 4 that fans didn’t know.
The main actor David Harbor shared at the San Diego Comic-Con 2017, the Duffer brothers will assign the film an ending, not letting it be too long like many current TV shows.

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