Stranger Things 4 originally planned to kill off Max permanently

The idea of putting Max in a coma actually came about during the 6 month pandemic delay, and the proposed ending was changed.

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Max Mayfield, Stranger Things Wiki

Stranger Things S4 E9: Chapter 9: The Piggyback / Recap - TV Tropes

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Stranger Things Season 4 Volume 2 Ending Explained

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Stranger Things' Season 4: Everything We Know So Far

Stranger Things' Season 4: Everything We Know So Far