It seems Harlan is in a good place at the end of season two, as he's last seen in the back of a car with his mom on the way to California. Yet all the trauma he went through, including killing his father, dying then coming back to life, and almost being taken by The Handler (Kate Walsh), could potentially be setting Harlan up to be the "big bad" for season three. For me, this theory hinges on whether or not Harlan can grow up in a loving household with his mother Sissy (Marin Ireland). If he's forced to grow up alone or worse, in an institution of some sort, he could end up wanting to take his revenge out on Vanya and the rest of the Umbrella Academy.