Worlds Collide

The Legends go back in time to National City, to fix a disruption in the timeline. When they fix the problem, they actually end up creating a bigger one in the process.

They go back to present day National City to make sure the timeline is in order, only to realize there's not much of National City left, more like there's not much of the world left!

They find out that when they fixed the disruption, they accidently caused a ripple effect in the timeline. Which caused the current Earth-Prime 2021 timeline to collide with a possible Earth-Prime 2150 timeline. They have to try to figure what happened to Earth, and how they can fix their mess.

As they try to figure out what happened (with the help of Gideon,) they soon figure out that they didn't just collide the current timeline with a possible future timeline, but they also somehow had a town, in the shape of a triangle, incased in some barrier of fog. No one can get in, and no one can get out. The entirety of that town has no idea what is happening outside it's walls. Just as things couldn't get any worse, Gideon reveals that the town is actually from another Earth. Earth-05 to be exact.

The Legends have to try to fix their mess, and get everyone back to their respected Earths and timelines, without screwing up anything else in the process. They would also need to enlist the help of some of their other friends on Earth-Prime, and maybe from the other places too.

They may screw things up for the better, but this time they just screwed up! Big time!

Note: This is an Arrowverse, The 100, and Wynonna Earp crossover. I do not own the characters of any of these shows.