Warning: The following contains SPOILERS for The Flash season 9.Mysteries and unanswered questions abound as The Flash season 9 races towards the series finale. This is not that surprising, as the final season of a long-running television show is often devoted to tying up whatever loose ends remain among the series' subplots. The Flash is notable, however, in that all of its remaining mysteries are tied to new storylines introduced within the past year.
The unifying theme of The Flash season 9 has been change and how people adapt to it. From Joe West leaving Central City to Chester and Allegra finally realizing they belong together, every storyline in The Flash season 9 has centered around major life changes for the ensemble and the problems that come with failing to deal with them. However, despite the show resolving many long-running storylines, such as Barry and Iris preparing to become parents, there are still three major mysteries the show has yet to address as The Flash season 9 heads into its final run of episodes.
