Throughout the first part of "Stranger Things" season four, we see Vecna haunt and kill at least three people. By episode seven, it's revealed that the villain known as Vecna is really Henry Creel (aka "001" — the first kid ever experimented on at Hawkins National Lab). He has a clear antagonism with Eleven, who defeated him and seemingly banished him to the Upside Down in 1979 when she was still a little kid . But why is he back and murdering people in 1986? So far there aren't many answers about his strategy or how killing people is meant to serve a purpose to him. One of the strangest details about the gruesome way Vecna murders people is by sucking their eyes into their heads, leaving blank and bloody sockets behind. What's up with that? Does killing people in this ritualistic way somehow make Vecna stronger? Or give him more insight into Hawkins? Eleven's powers were the result of an experiment done with her mother that included drugs like LSD and time spent in sensory deprivation tanks when she was pregnant. But in the flashbacks to young Henry's life, he simply says that he became aware of his abilities when he was a young boy. Where did they come from? Something else supernatural? A chemical experiment his father was a part of during World War II? This season "Stranger Things" revealed that Hopper was making Agent Orange (a deadly chemical weapon used in the Vietnam War) as a teenager. In his monologue to Alexei, Hopper says he believed his daughter's illness was the result of Agent Orange, given that he handled it so often without any protection. There seems to be a link between Eleven's mom getting experimented on by the government, Hopper's daughter dying as a result of government-led chemical warfare, and Victor Creel's son manifesting mysterious powers. We could be wrong, but it'd be awesome to get more answers about why Hopper's backstory became more relevant this season again. As we noted in our breakdown of the 21 details you might have missed in "Stranger Things" season four , the flashback to Eleven's attempted escape from Hawkins Lab shows her running down a familiar flight of stairs. Hopper was in that same stairwell when he was grieving over his daughter's death in a hospital room. Does that mean Sara died inside HNL? This season we got the reveal that Hopper believes that Sara died due to birth defects related to Agent Orange. But why would that have landed her in the secret hospital lab in Hawkins? Insider asked Harbour back in 2017 if he could tell us more about this connection between Sara's hospital room and the HNL. "Hmmmm [laughing] I can not," Harbour said. "But yes, it is the same location. So that's interesting. Or it's a similar location. But there's actually another thing you'll notice which is that there's a stuffed animal lion that appears in Eleven's room when he breaks into the lab and finds that room, and it also appears in Castle Byers, and it also appears on Sara's lap. " For a full breakdown of all the connections between Hopper, his daughter Sara, and Eleven, read our full report here . We know all about Eleven's mother, Terry Ives. But so far "Stranger Things" has yet to tell fans anything about her father. Is it literally Dr. Brenner? If so, that makes his experiments and behavior even more disturbing, given the torture and emotional abuse the children suffered inside Hawkins National Lab. And if it's not Brenner, then will we learn who the real father was sometime before the series comes to an end? OK so this one we technically already have the answer to: No, the character on the show didn't forget Will's birthday is March 22. The Duffer Brothers forgot. "Cleary like the characters in the show, we also forgot about Will's birthday," Matt Duffer told Variety . "So the debate now is whether we adjust Will's birthday or we just let it be really sad. " Ever since the first episode of this show, allusions to Will Byers being gay have been made by his mom and friends. By the time season three came around, and all his friends had girlfriends, Will had a heated conversation with Mike that ended with the latter saying: "It's not my fault you don't like girls. " While Mike may have meant it in a different way, Will's reaction made it seem like he felt stung by the implication Mike was making about his sexuality. Now in season four, there are more hints about Will's sexuality. "Stranger Things" begins with the disappearance of Will Byers. He was in the Upside Down, far out of reach of any regular human in Hawkins. But when Mike brought Eleven to his house, she saw a photo of Will and recognized him. Mike hadn't even mentioned that Will was missing, but Eleven somehow knew not only who Will was but where he was. How? When would she have seen him before? There's still a lot unknown about the time between Eleven re-opening the Gate to the Upside Down and her escape into Hawkins — and we want some answers! In an interview with Insider, Noah Schnapp (who plays Will) played the "two truths and a lie" game , where he told us three things that could happen in the upcoming episodes. "A main character dies," Schnapp said to kick off a round of "two truths and a lie" — a game where he makes three statements about the upcoming season of "Stranger Things" and leaves it up to fans to decide which one is the lie, and which two are really going to happen. "There's an intense romance this season," Schnapp said for the second statement in the game. He paused for a moment, trying hard to think of a good third possibility that fans can chew on. "The Upside Down eats up Hawkins," he said at last. "Like, takes over the real world. " Then, on a newer interview with Jimmy Fallon , Schnapp once again teased "deaths" that were coming. This has us concerned that a main character really will die. Will it be Steve? Or one of the younger kids? In "Stranger Things" season four, Nancy realizes that the Upside Down is an exact mimic of the real Hawkins — but it's frozen on the day Will went missing in 1983 (November 6). That means any changes made in Hawkins since that date aren't reflected in the alternate dimension. But that's not how the Upside Down worked in the past. Joyce was able to put up the lights and letters in Hawkins and have them reflected in the Upside Down immediately, allowing Will to see the letters and communicate with her. As far as we can tell, the Upside Down used to mirror real world changes in real time. But now it's not? How come? Did it perhaps revert back to that date for some reason? Is there a bigger connection between Vecna and Will's disappearance than we realize? Last we saw her, Nancy had been drawn into Vecna's curse. We know a powerful song like Kate Bush's "Running Up That Hill" is the one thing that could bring her back — but what song would it be? There haven't been any mentions of Nancy's favorite music recently, but hopefully her friends will figure out the right one in time. While manipulating Eleven into helping him, Vecna advises her to use a memory from her past that made her both sad and angry. He says that "001" (himself) learned how to become more powerful by tapping into a memory like that. But what was his earliest sad memory? In his flashbacks we don't see anything particularly bad happening to young Henry Creel. Perhaps there's more to his backstory (and the revelation of how he got his powers) than meets the eye. When we were first introduced to Brenner and Hawkins National Lab in season one, Eleven was the only kid around. Was that because Brenner stopped trying to bring new children into the lab after Vecna's massacre? Or were there new kids, but we just haven't met them yet? In "Stranger Things" season two, Eleven met her "lost sister" — Kali Prasad. She's tattooed with "008" on her wrist, and has illusion powers that seem similar to what Vecna can do. Will she come back into the story? Her powers combined with Eleven's could be very useful in defeating Vecna once and for all. This season, Dustin theorizes that Vecna is the Mind Flayer's "five-star general. " But wouldn't it make more sense if it's the other way around? Vecna is a villain with clear motivation and ties to Hawkins and Eleven. We think it makes sense if Vecna has been the one in charge, sending different supernatural creatures like the Demogorgon and Mind Flayer out into Hawkins to hunt down Eleven. If not, then we have more questions about why the Mind Flayer was so focused on controlling Eleven and Hawkins. For more on this, read our full timeline of the major events in "Stranger Things" that shows how Vecna, the Upside Down, and Eleven are all connected. .