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.
Did You Know?
The first full Arrowverse crossover to include the Supergirl episode in the actual plot of the crossover; the previous year's Invasion! storyline only included a brief teaser scene at the end (which was repeated in the episode of The Flash that followed) and a few brief teaser shots of Team Flash's attempt to reach Kara throughout on the Supergirl side of things, while the year before that the show was on a separate network and unable to cross over at all. Supergirl and some of the other characters have been included in individual crossover episodes, but those events took place entirely on one show ("World's Finest" on Supergirl (episode 1x18) and "Duet" on The Flash (episode 3x17)) with maybe a teaser on the other for continuity. See more
At 00:52 the arrow that hits the scientist is green, while the Oliver from Earth X carries red arrows in his quiver. That green arrow also did not belong to Earth X's Prometheus(Tommy Merlin) as he carries black arrows in his quiver. See more
[after the fight in church, with carnage all around him
Best wedding ever!
The usual opening narration and title card are replaced by a special "Crisis on Earth-X" sequence. See more
Runnin' Home to You
Performed by Melissa Benoist
Written by Benj Pasek
and Justin Paul
Arranged by Daniel James Chan See more