
The first seven episodes of the most recent Stranger Things season featured a number of significant revelations, such as how Hopper survived and was later taken by the Russians and the real purpose of the Creel mansion that had received so much attention. One of the major revelations came during the flashbacks in episode 7, when Eleven was battling Henry Creel at the Hawkins lab after he had slaughtered the other kids in his quest to kill anyone connected to Dr. Brenner's experiments. The events of the series and season would begin when Eleven would just barely overpower Henry and knock him into the Upside Down, opening the first doorway to the frightening realm.
Millie bobby Brown recently discussed her feelings on the Stranger Things season 4 revelation that Eleven opened the original door to the Upside Down in an interview with Variety for the popular show. Eleven did not create the Upside Down, according to Brown, who responded to the question about whether she was responsible for establishing the parallel reality by citing the Duffer Brothers.