- "This is sick."
- "You mean looking at your reflection and seeing only weakness? I agree."
- —Oliver and Oliver
"Crisis on Earth-X, Part 2" is the eighth episode of the sixth season of Arrow, and the one-hundred-twenty-third episode overall. The episode is the second of a four-part crossover with the eighth episode of the third season of Supergirl, eighth episode of the fourth season of The Flash and eighth episode of the third season of DC's Legends of Tomorrow.
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.
- Felicity referred to Oliver of Earth-X as "Oliver in the High Castle", a reference to the television series and novel, Man in the High Castle, which also depicts a world where the Nazis won World War II. Similarly, the television adaptation explored alternate dimensions in its second season.
- This is the first Arrow episode to air on Monday.
- This is the first episode of Arrow in which John Diggle does not appear. This makes Oliver the only character to appear in every episode to date.
- When Oliver says,"You couldn't leave one for me?" to Barry Allen, it refers to when Nate Heywood said the same thing to Wally West in Aruba-Con.
- The Green Kryptonite arrow used by Oliver against the Kara of Earth-X is a reference to the arrow used by an older Oliver to stop Superman in the Dark Knight Returns storyline. Oliver's stated reasons for having such weaponry - to protect against evil Kryptonians - is also similar to Batman's motivation for creating anti-Superman weaponry in the pre-Flashpoint continuity of the comics.
|Arrow season 6|
|"Fallout" • "Tribute" • "Next of Kin" • "Reversal" • "Deathstroke Returns" • "Promises Kept" • "Thanksgiving" • "Crisis on Earth-X, Part 2" • "Irreconcilable Differences"|
|"Divided" • "We Fall" • "All for Nothing"|