In Stranger Things season 2 episode 6 which is titled as “The Spy” Will is shown rushed to the lab where he fails to recognize anybody. After speculating Owen comes to the conclusion that damaging the vines in the tunnels is somehow affecting Will. Hopper is shown in the basement of the lab where a giant gate to the upside down has been found under the floor. After a series of events that take place, Will is shown to announce that he knows the way to stop the shadow monster. At the end of the show, it is seen that a team of soldiers is being sent to the tunnels by Owens where they are being killed by the demodogs.