Not a dream, not an imaginary story, not an elseworld. This is Flash Fact: When Barry Allen wakes at his desk, he discovers the world has changed. Family is alive, loved ones are strangers, and close friends are different, gone or worse. It's a world on the brink of a cataclysmic war – but where are Earth's Greatest Heroes to stop it? It's a place where America's last hope is Cyborg, who hopes to gather the forces of The Outsider, The Secret 7, S!H!A!Z!A!M!, Citizen Cold and other new and familiar-yet-altered faces! It's a world that could be running out of time, if The Flash can't find the villain who altered the time line!
Flashback sequence of Barry Allen and his mother who are stuck on the freeway, then years later Barry Allen is dowsed by chemicals and hit by the Lightning that would turn him into the Flash. Meanwhile somebody narrates as the flashback shows the Flash's life as it goes by. Barry Allen gets married to Iris West. Then he made a family of speedsters. Then the narrator tells a little about himself declaring himself not the hero of the story, and that he had nothing to live for until he met the Flash. In the present, Barry Allen wakes up at work to be confused by director Singh talking about Captain Cold is Central City's greatest hero. Barry then notices he doesn't have his ring, then he is confronted by his mother who is still alive. Then he tries to figure what's going on, by contacting the Justice League, then his mother explains that there's no Justice League, but there is a Batman.
In Gotham City, Batman is chasing Yo-Yo, a criminal connected to the Joker. He interrogates her, because he needs to save Judge Dent's twins but she doesn't reveal anything so he pushes her off an edge only to be saved by Cyborg. Cyborg wants to convince batman into joining the super-human resistance.
In Central City, Barry tries to talk to Iris West, who is in love with another man and hasn't met Barry. Mrs. Allen hears a voice that says "how nice to see you alive and well, Mrs. Allen." Then Barry decides to travel to Gotham City.
In Gotham City, Cyborg is trying to recruit Batman into joining the resistance. Batman decides not to join the resistance making the rest of the members give up on joining the resistance. Hours later Barry Allen makes it to Wayne Manor, looking for Bruce. The narrator notes that the first time he met Barry Allen he nearly killed him, signifying that the narrator is Batman. Batman throws Barry around attacking him, until he says "Bruce, Wait!". Then Barry realizes that this Batman isn't Bruce Wayne, but instead Thomas Wayne.