: At a Halloween party, Nancy struggles with her guilt over Barb’s death. After getting drunk, she has a volatile argument with Steve, admitting she doesn't love him and calling their relationship "bullshit," which prompts Jonathan to drive her home.
: Flashbacks reveal that Eleven escaped the Upside Down shortly after the Season 1 finale by widening a temporary portal in the school. In the present, she is living in secrecy with Hopper, who forbids her from going trick-or-treating for her safety, leading to a tense "compromise" where they plan to celebrate at home together. [S2E2] Chapter Two: Trick or Treat, Freak
: Mike, Will, Dustin, and Lucas famously dress as the Ghostbusters for school, only to realize they are the only ones in costume. : At a Halloween party, Nancy struggles with