Netflix has released a new and final Stranger Things 3 trailer, offering one last look at the new season of the smash-hit series. While previous trailers have leaned heavily on the “summer lovin’” vibe of the new season, which takes place in the summer before the kids enter high school, this new and final trailer raises the stakes and goes heavy on the action and drama. Indeed, the Mind Flayer is back (or maybe he never left?) and looking for a new host—which he finds in Dacre Montgomery’s antagonist Billy. We were first introduced to Billy in …