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?
Former Arrow actress Susanna Thompson (Moira Queen) has an uncredited role as the voice of the the A.I. of the Wellenreiter. See more
Steel catches Supergirl when she falls from orbit, producing an explosive impact effect. While the ground directly beneath his feet is bare earth (as opposed to the grass around him) and there's a ring of dirt around them, the area where Steel is standing on is level with the rest of the ground and Steel's feet haven't sunk at all beneath the surface. At a minimum, his legs should have been driven into the ground by the force of the impact. See more
This guy's like the Terminator.
Why are you laughing?
I just love a good pop culture reference in a moment of crisis.
The usual opening narration and title card are replaced by a special "Crisis on Earth-X" sequence. See more
References Superman II