Vecna, Stranger Things
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Variety spoke to Ross and Matt Duffer about the first four episodes of the final season, and asked if the cave is a reference to The First Shadow (the Stranger Things prequel play)— where young Henry encounters a cave in Nevada "connected to the Upside Down."
Warning: MAJOR SPOILERS are ahead for Volume 1 of Stranger Things Season 5, with all four episodes available and streaming now with a Netflix subscription. Go back to the Rightside Up if you're not ready for the latest on the Upside Down!