After 9 Years, ‘Stranger Things’ Finally Explained the Upside Down

Note: This story contains spoilers for “Stranger Things” Season 5, Vol. 2

Not even Shawn Levy, an executive producer who’s been with “Stranger Things” since the beginning, fully understood what the Upside Down was the first time around.

“I am one of those audience members who are super grateful for the visual aids, props and drawings that the Duffers brilliantly use to illustrate and explain dense mythology,” Levy told TheWrap.

Put most simply, the Upside Down is...