The Atom and the other Legends return just in time to come to the aid of Supergirl and the others who have been imprisoned by Earth-X Oliver and Overgirl — who plan to use their Waverider to attack Central City. Meanwhile, one of the Legends lies near death in the aftermath of the fight to get home from Earth-X.

U.S. air dates are in MM.DD.YY form. U.K. air dates are in DD.MM.YY form.

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THE EPIC FOUR-WAY CROSSOVER WITH "ARROW," "SUPERGIRL," "THE FLASH" AND "DC'S LEGENDS OF TOMORROW" CONCLUDES

Barry (guest star Grant Gustin) and Iris's (guest star Candice Patton) 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 (guest star Wentworth Miller), The Ray (guest star Russell Tovey), Felicity Smoak (guest star Emily Bett Rickards), Iris West and Alex Danvers (guest star Chyler Leigh) to take on their most formidable villains yet. Earth's mightiest heroes - Green Arrow (guest star Stephen Amell), Supergirl (guest star Melissa Benoist), The Flash (guest star Grant Gustin) and White Canary (Caity Lotz) - lead their teams into battle to save the world.

Gregory Smith directed the episode with story by Marc Guggenheim & Andrew Kreisberg and teleplay by Phil Klemmer & Keto Shimizu (#308).