Warning: This article contains spoilers for Stranger Things season 4
Stranger Things production designer Chris Trujillo has confirmed how time works in the Upside Down. As promised by its cast and creators The Duffers Brothers in the lead up to its release, Stranger Things season 4 has proved the show's most horror-fuelled installment yet. After the Battle of Starcourt Mall in season 3 saw the defeat of the Mind Flayer, the Upside Down has now revealed its major villain in Vecna, a terrifying creature who preys on his victims' past trauma and kills them from his lair in the alternate world hidden beneath Hawkins. While Stranger Things season 4 saw the original Hawkins gang split up across the country, Steve, Nancy, Robin and Eddie become stuck in the Upside Down attempting to find Vecna.
The last episode of Stranger Things season 4, part 1, «The Massacre at Hawkins Lab,» saw Vecna explain his origins to Nancy after she was trapped in his lair. Finally bringing the Hawkins gang and Eleven's season 4 story together, Vecna was revealed to be both One and the son of Victor Creel, transformed into the horrifying villain after Eleven learned of his true motivations and banished him to this dark version of Hawkins. However, just before this shocking twist, Nancy and the others find themselves exploring the Upside Down, only for Nancy to realize that this version of her bedroom appears stuck in 1983, rather than their current 1986. While there have long been theories about the Upside Down's timeline, this seemingly confirmed that the world exists in a seperate time to real-world Hawkins.
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In a new video, Trujillo confirmed that this is indeed the case.
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