The saga of Theon Greyjoy is a tragic one. Sure, he started out as a jerk and betrayed the family he'd grown up with, but he's gone through horrific trauma and come out the other side wanting to help the good guys however he can. In season seven he's too frightened by his uncle Euron's attack to save his sister Yara from being kidnapped, but by the season finale he resolves to get her back from his uncle's clutches so she can still take her place as ruler of the Iron Islands.
We're all rooting for him to succeed, but Theon and his followers are facing down a very serious (and very insane) enemy who's out to get what he wants at any cost. The season eight trailer doesn't show either Theon or Euron, so we can only wonder. Will Theon be victorious? Will he and Yara restore the Greyjoy house to glory?