Barry and Iris’s wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony. All of the superheroes band together with help from their super friends like Citizen Cold, The Ray, Felicity Smoak, Iris West and Al... (more)ex Danvers to take on their most formidable villains yet. Earth’s mightiest heroes — Green Arrow, Supergirl, The Flash and White Canary — lead their teams into battle to save the world.

Caity Lotz, Candice Patton, Chyler Leigh, Colin Donnell, Danielle Panabaker, Dominic Purcell, Franz Drameh, Grant Gustin, Melissa Benoist, Russell Tovey, Tom Cavanagh, Victor Garber, Wentworth Miller