Plot summary
Will is rushed to the lab, demonstrating memory loss. Owens theorizes that the shadow monster is a virus that has spread to Will's brain and is controlling him, and that the creatures from the Upside Down share a hive mind. Therefore, damaging the tunnels will be lethal to the now-infected Will. Nancy and Jonathan spend the night at Murray's, who forces them to admit their feelings for each other. The following morning, the trio send copies of the tape of Owens' admission to numerous newspapers around the country. Nancy and Jonathan discover Will's drawings upon returning to the Byers' house.
Lucas and Max regroup with Dustin and Steve, and the group attempt to lure Dart to a junkyard. Max apologizes for being hostile to Lucas, explaining that Billy's violence results from his father getting re-married to Max's mother. Dart arrives in the junkyard flanked by a pack of adolescent monsters. Steve and the kids are cornered until the pack unexpectedly run away. Steve realizes that the Demodogs are being summoned elsewhere. Will discovers a location that the monster prevents him from seeing. Unaware that the monster is manipulating Will, Owens sends a team to investigate. The team is killed by the demodogs, who make their way into the lab.
Credits
Adapted from Wikipedia contributors, Stranger Things season 2. HTML formatting and reference markers removed.