Stranger Things has a post-credits scene. SPOILER WARNING: Stop reading if you haven't finished season 3.
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The scene begins in Kamchatka, Russia with two Russian guards walking towards a prison cell.
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One guard tells the other not to open a door because of an American, pointing to a second door instead.
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A Russian prisoner is then taken to a caged room.
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It's revealed the Russians have a Demogorgon and are willing to unleash it on the prisoner.
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The post-credits scene raises two key questions: Who is the American? And how did the Russians get a Demogorgon?
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The American is most likely Hopper and how he fell into Russian custody when he's believed dead will be explained.
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The Russians' Demogorgon may explain why they were in Hawkins: to get more Demogorgons for themselves.
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These post-credits questions will definitely be addressed when Stranger Things finally returns for season 4.
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