Flashpoint (Earth-Prime)

"Why are you so against this? Because when I had a chance like this once, when I went back to save my mom from Thawne, I did it because I was trying to recreate a perfect past. But it was a lie, and it all came crashing down in the end because I refused to see the warning signs because I didn't listen to my friends or my family. We can't... resurrect the past. It's too dangerous."

- Caitlin Snow and Barry Allen

Flashpoint was an alternate timeline created by Barry Allen.

History
At some point, Barry Allen went back in time and created a Time Aberration. He then reversed the timeline creation and supposedly restored the timeline. However, damage was made to the timeline and Team Flash members were forced to deal with the fallout.