It was called the Zero Hour.

I can't explain it. Not totally. A Green Lantern got into playin with time, tryin' to fix things that went bad. Ended up destroyin' a lot more than he created. While tryin' to fix that, they opened more space-time rifts. I flew right through one.

They managed to tie everythin' up in a nice new bow, though I can't explain how. I was more in the background for all of that. But it meant that I couldn' go back to where I came from.