Some unusual serial murders start occurring in Hawkins and Upside Down vines start spreading above ground. The US Army arrives to quarantine the vine infested areas, while the Hawkins Party, which includes new character Eddie Munson, figure out that two new characters, Victor Creel and Peter Ballard, are responsible for the murders and vine sitch and so they try to warn the US Army.
A new character, Colonel Sullivan, wants to handle the sitch in a way that could get a lot of people killed, so it's basically up to The Party to save the day. Russian Spies cause problems for the US Army while a new character, Jason Carver, and Jason's gang causes problems for The Party, because they think Eddie Munson is the Hawkins serial murderer.
Murray uses his detective skills and friends/contacts in Russia, who aren't associated with the Red Army, to discover that Hopper is in Kamchatka. He tells Joyce, who asks for Sam Owens help, but the US Government won't approve a rescue operation in Russia, because it's the Cold War and they don't want give the Russians a reason to attack them. So Joyce and Murray hire a new character Yuri, who's a smuggler, to fly them to Russia illegally.
Mike is staying with the Byers over the holiday break and he, El, Will, Jonathan and new character Argyle, get involved in a plot that involves more Russian Spies, Sam Owens and possibly some former associates of Brenner, and (fingers crossed) Kali and her gang.
In Kamchatka, we find out that the Red Army are breeding and training Demogrogons, and that they did this by extracting vines/slugs from the Hawkins Gate they opened the previous year. They also haven't been able to open another Gate since, but they are getting close to doing so. Hopper plans to ruin the Red Army's plot to open a Gate and he also plans to escape from Kamchatka, but a new character Dmitri, a Russian prison guard, keeps a close eye on him and could stop him.
That's all I got.
