The camera pulls back from the Snow Ball, out of the gym, into the snowy Hawkins night. We zoom into the school’s basement, then down into the earth... and into the Upside Down.
But after Kali tries to make Eleven kill a man in cold blood, Eleven realizes this isn't her. She remembers Hopper, Mike, and her friends. She rejects Kali’s path, uses her powers to escape, and returns to Hawkins to save her real family. Back in Hawkins, things are getting worse. Dart has grown rapidly, molted, and escaped into the sewers. Dustin realizes with horror: Dart is a baby Demogorgon. Stranger Things -2017- Season 2 Web Series
There, in the dark, icy wasteland, we see the —a colossal, 50-foot-tall spider-like shadow—towering over the ruins of the Hawkins Lab Gate. It stares directly at the camera (and thus, at the real world), letting out a low, rumbling growl. The camera pulls back from the Snow Ball,
After a fight where Eleven uses her powers to throw Hopper across the room, she runs away. Using her powers, she locates her mother, , in a catatonic state, and her aunt. Through a sensory deprivation tank, she mind-dives into her mother’s memories and sees that she has a "sister"—another test subject from Hawkins Lab. But after Kali tries to make Eleven kill
Using Will as a spy, the Mind Flayer sends the Demo-dog army to attack Hawkins Lab. Hopper, Joyce, Mike, and the kids are trapped inside. A massive shootout occurs. Bob dies. The soldiers die. Just as the Demo-dogs break through the final doors, Eleven arrives.