Supergirl
Season 3 Episode 8 - Crisis on Earth-X (I)
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. The crossover continues on Arrow S06E08 Crisis on Earth-X (II), The Flash S04E08 Crisis on Earth-X (III) and DC's Legends of Tomorrow S03E08 Crisis on Earth-X (IV).
Episodes in Season 3
Girl of Steel
42 min
Triggers
42 min
Far From the Tree
42 min
The Faithful
42 min
Damage
42 min
Midvale
42 min
Wake Up
42 min
Crisis on Earth-X (I)
42 min
Reign
42 min
Legion of Superheroes
42 min
Fort Rozz
42 min
For Good
42 min
Both Sides Now
42 min
Schott Through the Heart
42 min
In Search of Lost Time
42 min
Of Two Minds
42 min
Trinity
42 min
Shelter from the Storm
42 min
The Fanatical
42 min
Dark Side of the Moon
42 min
Not Kansas
42 min
Make It Reign
42 min
Battles Lost and Won
42 min