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Barb wakes up in an empty pool near a dark creature. She tries to climb out in vain. Joyce strings Christmas lights around her home, establishing communication with Will, who can turn them on and off. Hopper and his deputies research Dr. Martin Brenner, the laboratory, and a woman named Terry Ives who claimed her daughter was taken by scientists. El has a flashback in which Brenner, whom she calls "Papa", has her put in solitary confinement for refusing to telekinetically harm a cat. Nancy worries about Barb, who is missing. Steve and his friends discover Jonathan's photographs and destroy them along with his camera, but Nancy notices a photo of Barb before she disappeared and returns to Steve's house to search for her. Nancy finds Barb's car and sees the creature in the woods. Joyce establishes a code with Will using the lights, which he uses to tell her that he is alive but unsafe. He tells Joyce to run as a creature begins to climb through her wall. Will's body is discovered in a quarry.