The gang hatches an electrifying plan to reconnect Will to the hive mind. Tensions flare during a search of the Upside Down's Hawkins Lab.

As Holly and Max fight to escape Vecna's mind, El must find a way into Will's. Joyce wrestles with guilt. Jonathan and Nancy face a turning point.

On the anniversary of Will's disappearance, the party reunites to prepare for a battle with world-altering implications.