What Is the Upside Down? - How Did Will Byers Get Into the Upside Down?

It's hard to keep up with Stranger Things, so here's a quick explainer on the Upside Down and how Will Byers got into the alternate dimension.

The neoliberal Upside Down

How did Will end up in the Upside Down in the first season of 'Stranger Things'? - Quora

Stranger Things' Upside Down explained: Its origin, Vecna, and more - Polygon

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plot explanation - How was Will aware of the lights? - Movies & TV Stack Exchange

Stranger Things' Upside Down explained: Its origin, Vecna, and more - Polygon

Stranger Things: Did Will Byers accidentally create the Upside Down?

New Stranger Things comic to explain what happened to Will in the Upside Down

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Stranger Things' Upside Down explained: Its origin, Vecna, and more - Polygon