7) The Legends Save The Day
The Legends of Tomorrow being part of this crossover is very exciting indeed, and it should be a priority to have them play a key role in whatever threat all of these heroes assemble to go up against.
It would be too easy to make characters like Green Arrow, Supergirl, and The Flash the ones who save the day, and having these more obscure, B-List characters (which is how they’re also viewed in their own reality, hence why Rip Hunter recruited them in the first place due to their disappearance having no significant impact on the timeline) be the ones who step up is a must.
Whether they swoop in at the last minute or play a pivotal role in this adventure from the off, it would be a refreshing change of pace to see the likes of Rip Hunter, Heat Wave and White Canary be the ones who steal the show from the bigger name heroes. It would actually go a long way in helping to legitimize them, too.