Megan and Casey, two college grads embarking on a three-month hike, confront irrevocable truths about their friendship.

After new information surrounding Jason’s death comes to light, Cheryl finds herself under a cloud of suspicion and forced to come clean about the last time she saw her brother….

An increasingly concerned Nancy looks for Barb and finds out what Jonathan’s been up to. Joyce is convinced Will is trying to talk to her.

On his way home from a friend’s house, young Will sees something terrifying. Nearby, a sinister secret lurks in the depths of a government lab.

Lucas, Mike and Dustin try to talk to the girl they found in the woods. Hopper questions an anxious Joyce about an unsettling phone call.