Millie Bobby Brown, David Harbour, Winona Ryder, their 'Stranger Things' costars, and series creators Matt and Ross Duffer promise the new season ups the horror to gruesome effect. The kids are grown, and the stakes are higher, the stars explain to Rotten Tomatoes editor Jacqueline Coley. Plus, why your favorite 'Stranger Things' pairings have swapped partners for season 4.

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