Actor Evan Peters has been rumoured to make an appearance on the show, and most people are speculating that his cameo will serve as the tie between Marvel and X-Men. But there is one theory to consider: Peters might be playing the adult version of Tommy, aka Speed. If the twins grow up as quickly as they grew in the womb, it could be safe to assume they'd be adults by the end of the series. This makes it easier for them to transition into superheroes in time for future MCU projects (however they get there). If this theory proves true, and Peters joins the Marvel family as Speed, the only question we have to ask is who will be Billy?