The Flash returns with season 3 this Tuesday( 4 October) at 8pm EST on The CW Network. The premiere episode is titled, Flashpoint, wherein new timeline, Flashpoint universe debuts as Barry Allen must decide whether he would continue living in this alternate world or return to his universe.
The official synopsis for episode 1 reads as follows:
Executive Producer Andrew Kreisberg spoke to Entertainment Weekly about this new timeline in season 3. He said, "It looks like our world. Most of the changes are to Barry's life and him being at the nexus of these changes. He's put all of the people that are in his life — Joe, Iris, Cisco and Caitlin — and spun them into different ways."
Comparing the show's take to the Comics, he said, "Obviously, the comic books dealt with this giant war between the Atlanteans and the Amazonians, and Thomas Wayne being Batman. All of that stuff is not at our disposal, which is fine with us because we really wanted to do something personal to Barry having changed his friend's lives and Barry coping with [the fact that] he may have traded his happiness for his friends."
The new timeline will begin to affect Barry, as Kreisberg explained, "There is a time clock on the storyline. Whether or not Barry will allow Flashpoint to continue, or whether he will reset things again, and the costs of him doing either is the ticking clock in the episode."