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 Alex 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.
Elenco: Caity Lotz , Amy Pemberton , Dominic Purcell , Nick Zano , Tala Ashe , Brandon Routh , Maisie Richardson-Sellers , Jes Macallan , Matt Ryan , Olivia Swann , Victor Garber , Franz Drameh , Arthur Darvill , Adam Tsekhman , Shayan Sobhian , Lisseth Chavez , Matt Letscher , Ciara Renée , Ramona Young , Wentworth Miller , Courtney Ford .