Long before season 5 premiered in November, Jim Hopper actor David Harbour assured fans that "the OG storylines" would all be wrapped up in satisfying ways. A tall order, really, given how many characters are still in play and the physics-defying reveals we've seen so far. But anything is possible!

Find all the connections from previous seasons and 'The First Shadow' play that may help you connect the dots as you watch 'Stranger Things 5' Vol. 2

Stranger Things Season 5 Episode 7 ending explained, with Will’s major reveal, Kali’s secret plan, and the mysterious Henry table scene.

Stranger Things Season 5 does something very sneaky and very smart. It turns Season 2 of the show into the emotional and story backbone of the entire show. Not Season 1.

The play reveals that the cave system was where Henry first ventured to Dimension X — now dubbed "The Abyss" in Stranger Things. That's the alternate dimension where the Mind Flayer and Demogorgons are from, as opposed to the Upside Down, which Volume 2 reveals is a bridge connecting the Abyss to our world.