Warning, the following post contains... Fox If you still haven't seen X-Men: Apocalypse continue under your own risk. OK, you've seen the movie and didn't understand what or who was in the last scene, right? Fox / Via Twitter: @amirahakiim Before we start, let's go back a few steps to make everything clear... The post-credit scene occurs inside the lab at the Alkalai Lake dam. Fox The same dam seen in X-Men 2, where William Stryker did his experiments on Wolverine. Fox As you probably remember, in Days of Future Past we saw a young Stryker looking for mutants to experiment on. At the end of Days of Future Past, Mystique, pretending to be Stryker, rescues Logan's body. Fox Since the new series of movies changed the past, the events of X-Men 2 ceased to exist. If Wolverine's mind came back to the (new) future, his body still stayed in the past. In Apocalypse it is never explained how, or why, but Logan fell into the hands of the real Stryker. Fox And Stryker experiments on Logan, giving him his adamantium skeleton, and turns him into a killer. Marvel As you must have seen in Apocalypse, Jean frees him from his prison and he practically destroys the entire lab. So now, back to the post-credits scene. Fox / Via Twitter: @LeoCC57 We see a cleaning crew taking away everything in the lab after it's been destroyed. Among thing things is a blood sample from Wolverine, which they put in a suitcase along with other samples. After closing the suitcase we can see it belongs to Essex Corp. Fox / Via Twitter: @LeoCC57 And that's it, it ends. You probably wondered... "What is Essex Corp?" Marvel / Via comicsalliance.com The name of the company likely refers to Nathaniel Essex. Marvel In the comics, Essex is a scientist specializing in genetics, and he is obsessed with human evolution. At some point, his path crosses with Apocalypse, who decides to give him powers and thus Essex ends up becoming ... Mister Sinister! Marvel One of the X-men's archenemies, frequently causing problems because of his obsession with creating the perfect human being. At some point, he even makes a clone of Jean Grey and gives powers to different characters through his experiments. And what's that mean? Fox It is very likely that Sinister, or some of his creations, will be the main enemies in the next X-men or a Wolverine movies which will be out next year. Although he may actually end up being the villain in other Marvel and Fox projects. Marvel According to an interview with the producer Simon Kinberg, the post-credit scene may have implications for more than just the X-Men and Wolverine franchises. Including movies starring other popular heroes. Marvel Sinister has a long story with Gambit (who will have his own movie in the future) and also with the mutant Cable, who will be in the Deadpool sequel, so maybe we'll be seeing a lot more of him soon. An actor even already offered himself for the role. Kevin Winter / Getty Images In the New York Comic Con, Bryan Cranston said that he would love to play the role of Minister Sinister in the X-men movies. Only time will tell how, when and where we shall see his debut. Marvel But everything seems to indicate that we already know who will be the next threat for the X-men.