This article contains spoilers for Stranger Things season 4 Volume 1.
Stranger Things season 4 saw Hopper face a Demogorgon in a Russian prison, an apparent plot hole that may actually hint at major changes in the Upside Down. Stranger Things has always existed against the backdrop of the Cold War; the experiments at Hawkins Lab are actually inspired by the CIA's sinister Project MkUltra, as the U.S. attempted to unlock the potential of the human mind as a weapon against the U.S.S.R. The Cold War finally came to Hawkins in Stranger Things season 3, when the Russians created a Gate of their own into the Upside-Down. Although the Gate was destroyed, Hopper was captured and believed killed by his friends and family.
Stranger Things season 4 picked up from this point, with Hopper learning the Russians had captured a Demogorgon before the Gate was closed. They were now using it in cruel sport, pitting desperate prisoners against it to keep the predator alive. But, as Hopper rightly realized, the Demogorgon's presence should be impossible. All creatures in the Upside-Down are bound together in a hive mind centered on Stranger Things' Mind-Flayer, and the closing of the Gate should have killed the creature when it was cut off. At first glance, this seems like a clear plot hole.
Related: Stranger Things' Vecna Identity, Powers & Origin Fully Explained
It's possible that, unlike the Demodogs seen in season 3, Stranger Things season 4's Demogorgon was strong enough to survive being cut off from the Mind-Flayer. More recently, though, it has likely grown stronger because its connection would be restored — with new Gates torn open by Vecna. Hopper is right to believe the presence of such a healthy Demogorgon should be impossible; he
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