Lucas warns Mike via walkie-talkie that government agents are en route. Mike, Dustin, and El flee the house and narrowly escape with Lucas; El telekinetically flips a van that blocks their path. At their junkyard base, Lucas reconciles with Mike and El. Joyce and Hopper are called to the police station, where they find Nancy with Jonathan, and Jonathan reveals his knowledge about the creature to his mother and Hopper. The group contacts Mike and his friends, and they rendezvous with him at the junkyard, formulating a plan to make a sensory-deprivation tank to amplify El's powers so she can search for Will and Barb. They break into the middle school and construct the tank in the gym. With Joyce's help, El successfully enters the Upside-Down to find Barbara dead and Will alive, hiding in the Upside-Down "Castle Byers", his fort. Hopper and Joyce attempt to break into Hawkins Laboratory to save Will, but are apprehended by security guards. Nancy and Jonathan resolve to kill the monster, and steal their hunting gear back from the police station. In the Upside-Down, the monster breaks into the fort where Will is hiding.