S3E4: Chapter Four: The Sauna Test

In "Stranger Things" Season 3, Episode 4, things are heating up in Hawkins. The episode wraps up with Hopper and Joyce making a surprising discovery at the abandoned lab. They find Dr. Alexei, a Russian scientist, and take him hostage in hopes of getting some answers about the strange goings-on. Meanwhile, Nancy and Jonathan are having their own bit of excitement. They break into the Hawkins Post to gather evidence about the rats but get busted by their boss Tom Holloway. It's not exactly a happy reunion as they're both fired for their trouble. On another front, Mike, Lucas, and Will continue their quest to figure out what's wrong with Eleven and Max. They suspect something is off with Billy and decide to investigate further, which leads them to some unsettling realizations about what's really happening in Hawkins. Dustin, Steve, and Robin are still on their Russian spy mission. They make progress deciphering the secret message they intercepted earlier. Their sleuthing leads them to discover an underground Russian lab hidden beneath Starcourt Mall. This is just the kind of twist that leaves you wondering what they'll stumble upon next.