Elektra

That theory makes a lot of sense, but how would Joe fit into that? Did Zoom show up, tell Mama West he was going to kill her future son, and so she left to protect Wally without telling Joe about the pregnancy or the threat? (it's possible).

We also heard spoilers that they shot a scene where Zoom drops Linda from the roof of a building, so that could also tie into Zoom trying to destroy Wally's future.