Many sacrifices will be made to save Hawkins, and the world.
El seeks the source at great detriment to herself. Robin and Steve are in big Soviet trouble.
Nancy, Jonathan, and the kids join forces while Chief Hopper and Joyce flee the big Russian.
Will and his friends look for the Mind Flayer. Nancy and Hopper uncover new info about Starcourt.
El and Max search for the missing lifeguard. Robin cracks the Soviet code.
Dustin tries to crack the Soviet code. Nancy and Jonathan find diseased rats. Eleven makes a relationship decision.
Hawkins, Indiana is experiencing strange things once more. And it's connected to the Soviet Union.