This article originally appeared on USA TODAY: 'Stranger Things' full series recap, including Season 5 Vol. 1 For " Stranger Things ," a nine-year journey filled with monsters, alternate dimensions and plenty of Eggo waffles is about to reach its end.

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.

Stranger Things 5 Volume 2 drops on Christmas Day. Find out what happened in Volume 1 before the new chapter begins

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 5, Volume 2 showed what happened when Max and Holly attempted to escape Vecna's mind prison and what they learned along the way. The post What Happens to Max and Holly in Vecna’s Mind Prison in STRANGER THINGS 5,

Review: The explanations get complicated as the Hawkins campaign figures out a plan against Vecna in Stranger Things: Season 5, Vol. 2.