SPOILER ALERT: This story contains spoilers from Season 5, Volume 1 of “ Stranger Things .”

The ever-calculating, always-planning, consistently confident Vecna Crawl team leader Nancy Wheeler ( Natalia Dyer ) made a mistake in the fifth and final season premiere of “Stranger Things”: not telling her parents and little sister that monsters were real.

Now, that error might cost Nancy and Mike’s (Finn Wolfhard) mom Karen (Cara Buono), dad Ted (Joe Chrest) and little sister Holly (Nell Fisher) their lives, as Vecna has unleashed the Upside Down on the entire Wheeler family in order to get to Holly and use her in his overall plan for world domination.

In a place as twisted as Hawkins, where giant rifts into the Upside Down opened up in the ground at the end of Season 4, what was the r

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