So I have a challenge for you writers out there, a crossover story with Ben 10 and the CWDC universe.
Plot: Due to an accident, Ben, Gwen, Kevin, and Alan Albright are stuck in the CWDC Earth for an indefinite period of time so they meet and team up with Team Arrow, Team Flash, and The Legends of Tomorrow, and after working with each time for a while they decide to become heroes in their own town.
CWDC timeline: Beginning of Season 4 for Arrow, Season 3 of Flash, and Season 2 of Legends and while you can make your own arcs of Ben's team with each DC group you must have Ben's team go through their own arc as if it was its own CW show. Also I don't think Ben's team will get along with every CW hero right away for whatever reason. Maybe Rene won't get along with Ben and Kevin because Rene thinks that maybe Ben could use the Ultimatrix and that maybe the plumbers should share alien technology with earthlings, and that since Ben is human he should have more faith in giving alien tech to humans. Or maybe Kevin doesn't get along with Lyla, you don't have to use these reasons if you don't want to I'm just giving examples.
Ben 10 Timeline: Maybe this story can be set after season 1 of Ben 10 Ultimate Alien so Albedo has been defeated and Ultimate Kevin has been stopped as well, and Ben still has the Ultimatrix so you can introduce the Aliens that appear in Omniverse.
Rules:
1: Canon Pairings.
2: No OC Aliens and no Original Ultimate Forms. The only Aliens that Ben can turn into are the ones that appear in the Original Show, Alien Force, Ultimate Alien, Omniverse, and the Remake of the original show
3: If you want to pair Alan and Ben up with someone it has to be a DC character that can appear on the show, they have to be Ben and Alan's age. Maybe the girl can be in a love triangle with Ben and Alan at first.
4: You can have other CW characters appear in the story other than during the Invasion Crossover.
5: I think it would be interesting how Ben's team sees how the CW DC universe isn't so black and white and how they react to it.
6: Give Ben and his friends their opinions on the heroes on this earth, Meta Humans, and Magic.