If you haven't seen the season finale of "The Flash" season 2, this is an obligatory spoiler alert.
In the episode finale of "The Flash" season 2, Barry went back in time to save his mother, Nora, on the night she died. Barry (Grant Gustin) didn't hesitate this time, and he was able to stop Reverse-Flash. There was a point where the Season 1 Barry peeked through the door and the two exchanged that knowing look that everything will change.
That change in the timeline will surely disrupt the reality and it is unknown as to what kind of consequences they will face.
Grant Gustin spills to TV Guide about what to expect in "The Flash" season 3. He explains that Barry Allen may not have powers anymore as he has already set himself on a different path after saving Nora. Without his tragic past, his origins as the Flash never happened.
Here comes Flashpoint. According to LA Times, by going back in time and changing it, Barry has changed both the rules of the series and the television universe it inhabits. In reality, this is the obvious setup for a version of the "Flashpoint" story arc that will allow CW to bring its disparate universes. Think "Supergirl" and "Legends of Tomorrow." And what of the Arrow-verse? It will also be affected. They are so closely knit that it will be a tricky situation for the showrunners to maneuver around.
Flashpoint sees Barry return to present day with no powers and no memory of the previous timeline. Barry is then set on a quest to regain his powers in a very unfamiliar world, in which Leonard Snart (played by Wentworth Miller) is actually the biggest hero in Central City and Batman's father is the Dark Knight. Will he forge a relationship with Iris on this new timeline?
