By Natalie Abrams
November 20, 2017 at 02:11 PM EST

Crisis on Earth-X is upon us!

During the CW’s crossover event, which will air across two nights starting Monday, Nov. 27 at 8 p.m. ET, the superheroes of The Flash, Arrow, Supergirl, and DC’s Legends of Tomorrow unite to take on the villains of Earth-X. Check out photos here.

Here’s what’s in store: “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.”

Crisis on Earth-X will air Monday, Nov. 27 at 8 p.m. ET and conclude Tuesday, Nov. 28 at 8 p.m. ET, airing two hours both nights.