Arrow
Season 6 Episode 8 - Crisis on Earth-X (II)
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 starts on Supergirl S03E08 Crisis on Earth X (I). It continues on The Flash S04E08 Crisis on Earth-X (III) and DC's Legends of Tomorrow S03E08 Crisis on Earth X (IV).
Episodes in Season 6
Fallout
42 min
Tribute
42 min
Next of Kin
42 min
Reversal
42 min
Deathstroke Returns
42 min
Promises Kept
42 min
Thanksgiving
42 min
Crisis on Earth-X (II)
42 min
Irreconcilable Differences
42 min
Divided
42 min
We Fall
42 min
All for Nothing
42 min
The Devil's Greatest Trick
42 min
Collision Course
42 min
Doppelganger
42 min
The Thanatos Guild
42 min
Brothers in Arms
42 min
Fundamentals
42 min
The Dragon
42 min
Shifting Allegiances
42 min
Docket No. 11-19-41-73
42 min
The Ties That Bind
42 min
Life Sentence
42 min