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 (Chyler Leigh) to take on their most formidable villains yet. Earth's mightiest heroes - Green Arrow (guest star Stephen Amell), Supergirl (Melissa Benoist), The Flash (guest star Grant Gustin) and White Canary (guest star Caity Lotz) - lead their teams into battle to save the world.
Did You Know?
Earth-X's Snart makes an overture towards Sara, a callback to their implied relationship in Season 1, thereby also suggesting that he, like Sara, is bisexual. See more
In the final scene where John is is about to conclude the ceremony a man with light pants and a blue top is walking from left to right in the background, when the close up is focused on Iris. The camera changes to John, the person walking is a completely different person, and the man with the light pants and blue shirt enters the shot now walking right to left. See more
Thanks for your help.
We're not done helping yet. Our enemies are still on your earth, Ollie.
Don't call me that.
Give it time, I'll get through that crusty exterior.
No, you really won't.
I was talking to you.
The usual opening narration and title card are replaced by a special "Crisis on Earth-X" sequence. See more