Hopper goes to the morgue and finds that the body is a dummy and, suspecting that Brenner is responsible, breaks into the lab. 5 5 "Chapter Five: The Flea and the Acrobat" The Duffer Brothers Alison Tatlock July 15, 2016 (2016-07-15) Hopper searches the lab, finding the substance in the basement, before being knocked out by the lab's guards. The boys ask their science teacher, Mr. Clarke, if it would be possible to travel between alternate dimensions, to which he answers that there could be a theoretical 'gate' between dimensions.