November, 1987. The gang evades the military to scour the Upside Down for Vecna — but fails to notice a threat lurking closer to home.

After a vicious attack at the Wheeler home, Mike and Nancy confront the cost of secrecy, while El and Hopper embark on a rescue mission.

Will gains unique insight into Vecna's next move, giving the crew an opportunity to set a trap. Holly explores her new surroundings.

The military tightens its grip on the town. Mike, Lucas and Robin orchestrate a daring escape. El comes face-to-face with the enemy.

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.