
In the weeks leading up to the premiere of Stranger Things’ fifth season, the creators, the Duffer Brothers, dropped several clues about what fans could expect. They’ve said a major focus was finally explaining the mystery of the Upside Down, something they’d been building towards for multiple seasons. This suggests they either had the answer planned from the start, or knew they’d eventually need a solid explanation. The latest season indicates that the true nature of the Upside Down was likely carefully considered as early as Season 4.