Flashpoint (Earth-1: Post-Crisis)

"What you did was you changed the future and you changed the past. If a person is stupid enough to mess with time... what you eventually end up with is this. The multiverse. Some strands run almost parallel. There will be inevitable intersections, and others that are just... wildly divergent. What it is... is a hot mess. It's a crapshoot. It's all just a crapshoot."

- Bruce Wayne to Barry Allen

Flashpoint was an alternate timeline created by Barry Allen.