Crisis on Earth-X logo "Things were looking a little grim, but part of me was, admittedly, a little excited for a "reunion" of old friends."

Cisco Ramon[src]

This episode is part of a larger crossover series, Crisis on Earth-X.

"Nazis? I hate Nazis."
Kara Danvers, Oliver Queen, and Barry Allen
"Crisis on Earth-X, Part 1" is the eighth episode of the third season of Supergirl, and the fiftieth episode overall. It aired on November 27, 2017.

The episode is the first of the four-part crossover, Crisis on Earth-X, with the eighth episode of the sixth season of Arrow, the eighth episode of the fourth season of The Flash, and the 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.[1]


  • One of the songs played right before the wedding ceremony is Joseph Haydn's "Gott erhalte Franz den Kaiser", also known as "Kaiserhymne", an anthem to Francis II, Emperor of the Holy Roman Empire, which would later become the anthem of Austrian Empire and is the tune of the "Deutschlandlied", the national anthem of Germany, used by the Weimar Republic, Nazi Germany and the current Federal Republic of Germany.
  • This is the first episode of Supergirl to centrally take place on Earth-1. It is also the first time Alex has appeared in a crossover as she was absent (off searching for her father) when Kara met Barry for the first time in "Worlds Finest" and was not involved with the Invasion! and "Duet" crossovers.
  • This episode marks the first time since "Fast Enough" that Eobard Thawne appears as Harrison Wells in present day.
  • At the beginning of the episode, after Kara defeated a Dominator, she said that the Dominators are "so last year". This is a reference to the previous year's crossover, Invasion!, in which the Dominators served as the main antagonists.
  • Mick asks Caitlin if he kidnapped her once, referring to the events of "Revenge of the Rogues".
  • Cisco refers to Harry as "Squidward", referencing the grumpy character Squidward Tentacles from the TV series SpongeBob SquarePants.
  • Martin synthesizes a way for Jax to retain superpowers, albeit not his original ones. When he describes them, Jax suggests that Stein's trying to turn him into the Marvel superhero Spider-Man. He questions whether he'll have Spidey-Sense, but Stein tells him he won't, mockingly calling himself "the Spectacular Sticky-Man".
  • The music that plays during Barry and Iris's rehearsal dinner is the same music played in the episode "Green Arrow" when Oliver is about to propose to Felicity.
  • When Barry asks Kara for a favor, he references the events of "Duet".
    • The song Kara sings is "Runnin' Home to You", the very same song Barry sang to Iris when he proposed to her, previously sung in "Duet".
  • William Katt cameos as the ill-fated minister who oversees Barry and Iris' wedding. Katt is best remembered for starring in the comedic superhero series The Greatest American Hero in the early 1980s.
  • When the Legends were in England, one of the knights says, "It's Robin Hood!" This confirms Robin Hood exists on Earth-1 and the Arrowverse, as he was mentioned to have been taught archery by Vandal Savage.
  • This episode marks the first appearance of Nora, Barry and Iris' future daughter in the Arrowverse, though until "We Are The Flash", she was known as Mystery Girl.
  • When talking about the multiverse, Kara says that there are 52 universes. This is a reference to the New 52, the 2011 reboot of the DC Comics
  • This is the first episode to feature Tom Cavanagh (Harrison Wells), Candice Patton (Iris West) and Jesse L. Martin (Joe West) outside of The Flash.


  • The resistance members at the start of the episode are seen carrying AK-47 assault rifles, which would not have been developed since the USSR had already been destroyed, and would not have had the capacity to reverse-engineer the German MP-44.
  • Dark Arrow fires green arrows at the scientist, but he only carries red arrows.
  • Barry and Iris were supposed to use "Runnin' Home to You" as their first dance,[2] but was used as the bridal chorus for the episode. However, Barry and Iris may have simply changed their minds between their initial decision and their actual wedding.




  1. 'Crisis on Earth-X' Arrowverse Crossover Description Released -
  2. "Finish Line"

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