Board Thread:The Flash discussions/@comment-9346948-20180424235801/@comment-3127448-20180425234553

Now that we know John Diggle, Amunet Black, and Gypsy are helping out to take down Devoe, they could have asked Supergirl too. They can have their annual Flash/Supergirl crossover. Just bring the heroes of earth 1, earth 2, earth 19, and earth 38 together. Don't think Earth 3 would have a big impact.

The whole scheme of Devoe is reason enough for another big crossover.