It is 1984 and the citizens of Hawkins, Indiana are still reeling from the horrors of the Demogorgon and the secrets of Hawkins National Laboratory. Will Byers has been rescued from the Upside Down, but a bigger, more sinister entity still threatens those who survived. As Will experiences terrifying visions of a towering shadow monster, his friends and family must uncover the truth behind a strange biological plague affecting the town's crops and the strange new creature Dustin keeps as a pet. Meanwhile, Eleven is revealed to be hiding in secret with Jim Hopper while struggling to control her powers and yearning to reunite with her friends. New arrivals like the rebellious Billy and the resilient Maxine 'Max' Mayfield shake up the local dynamics just as the barrier between dimensions begins to break down completely. The group of kids, along with Jim Hopper and Joyce Byers, must band together once again to prevent an apocalyptic invasion from the Upside Down.