The Umbrella Academy Season 2 ended on a pair of shockers. After believing Lila was a spy, hellbent on ruining the lives of the Umbrella Academy members, the Hargreeves siblings realized she was one of them. But meeting another of the Monocle's children wasn't shocking enough. When they got home, the Hargreeves met five more, and a different version of Ben — one who was alive, and far meaner than the one they'd grown up with. Now, all the Umbrella Academy Season 3 theories stemming from these twists are just a hint of how much more story there is to tell.
It never occurred to the members of the Umbrella Academy that meeting their father in 1963 would directly affect the future. But apparently, it did. Meeting Luther, Allison, Diego, Klaus, Five, and Vanya changed the Monocle's plans. He wanted kids who grew up strong and smart. He didn't consider it might be his fault how they turned out, or that being a better father to his adopted kids would create better adults. Instead, he assumed he'd chosen defective models the first time around, and then opted in the new timeline to go for a different set of children, and called them The Sparrow Academy.
It made for a very different present in 2019... and it means fans are frantically speculating how that will affect a potential Season 3. Here are some of the leading fan theories after Season 2's wild ending: