Warning! The following contains spoilers for The Flash episode “Mother.” Read at your own risk!
The Flash finally ended its Mirror Master (or Monarch?) arc, and while the episode brought lots of unexpected moments like the return of the original Harrison Wells, the problematic Ralph Dibny, and Iris West temporarily gaining powers, no twist could hold a candle to that ending scene. Granted, we’re still not entirely sure what that final scene meant, though the current prevailing theory is exciting.