|"Things were looking a little grim, but part of me was, admittedly, a little excited for a "reunion" of old friends."|
- "It's hard to believe a place like this actually exists, on any Earth."
- "I wish I shared your sentiment. But in all my travels to distant times, one thing that sadly remains constant is man's ability to feel hatred for other men."
- —Alex Danvers and Martin Stein on Earth-X
"Crisis on Earth-X, Part 3" is the eighth episode of the fourth season of , and the seventy-seventh episode overall. It aired on November 28, 2017. The episode is the third of the four-part crossover, , with the eighth episode of the third season of , eighth episode of the sixth season of and eighth episode of the third season of .
|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.|
- Grant Gustin as Barry Allen/The Flash
- Candice Patton as Iris West
- Danielle Panabaker as Dr. Caitlin Snow
- Carlos Valdes as Cisco Ramon
- Tom Cavanagh as Professor Eobard Thawne and Dr. Harry Wells
- Jesse L. Martin (credit only)
Special guest star
- Stephen Amell as Oliver Queen/Green Arrow and Oliver/Dark Arrow
- Victor Garber as Professor Martin Stein/Firestorm
- Emily Bett Rickards as Felicity Smoak and Felicity Smoak's Earth-X doppelgänger
- Caity Lotz as Sara Lance/White Canary
- Chyler Leigh as Dr. Alex Danvers
- Franz Drameh as Jefferson Jackson/Firestorm
- Paul Blackthorne as Sturmbannführer
- Jeremy Jordan as General Winn Schott
- Juliana Harkavy as Dinah Drake/Black Canary
- Melissa Benoist as Kara Danvers/Supergirl and Kara/Overgirl
Special appearance by
- Brian Cook as Nazi
- Brett Davidson as Nazi Facility Guard
- Frederick Schmidt as Metallo-X
- Micah Steinke as Nazi Soldier #1
Barry, Oliver, Sara, Alex, Martin, and Jax wake up in a Nazi concentration camp on Earth-X, with handcuffs and power dampening collars. They wonder of all the "undesirables" the Nazis have rounded up. Jax asks from one of the captives, what was his crime, and he says he loved the wrong person.
On Earth-1, the Nazis have rounded up nearly everyone in the S.T.A.R. Labs pipeline (including Cisco, Caitlin, Wells, Wild Dog, Mr. Terrific and Black Canary). At the same time, Kara has been strapped into a surgery table with artificial red sunlight from the Prism siphoning her powers. Thawne is preparing for the surgery, but it takes a while for Kara's powers to reach the point it can be performed. Overgirl then has a private chat with her doppelgänger, and mocks Kara for protecting the weak, while she has taken on the belief that it is the purpose of the weak to fuel the strong and how she revels in being regarded as a god. Kara sees that Overgirl's ideology is not leading, but ruling. Overgirl agrees with that and tells Kara that her heart is worthless. But Kara counters it by saying that at least she has a heart. In the ventilation shafts, Felicity and Iris hear everything and they have to figure out, how to save Kara and others before the surgery is performed.
On Earth-X, the heroes are taken away by the leader of the concentration camp, who is revealed to be the Earth-X doppelgänger of Quentin Lance, known only as Sturmbannführer. He talks with Sara, telling that he once had a daughter like her, and killed her due to her sexuality. They are taken away to be executed, alongside the prisoner, Ray Terrill, whom Jax talked with. Oliver attempts to strike at the Nazis, but their collars act as shock collars, and they are easily put down. As the execution takes place, the heroes are suddenly rescued by Earth-X doppelgänger of Leonard Snart, Leo Snart aka Citizen Cold. In the chaos, the heroes manage to break free and escape with Leo and Ray to the Freedom Fighters hideout, an Earth-X version of Arrowcave in Star City.
Back at Earth-1, Felicity and Iris attempt to free everyone from the pipeline, but before they succeed, they are just about to be spotted. Instead, Felicity sends a distress signal to the Legends.
The Freedom Fighters are led by General Schott, Earth-X counterpart of Winn Schott. He reveals the only way back to Earth-1 is through a breach facility, and he doesn't allow Earth-1 heroes to pass through it, as destroying it presents an opportunity to trap Nazi leaders, Dark Arrow and Overgirl, to Earth-1, and give the Freedom Fighters a chance to liberate Earth-X. Alex tries to convince him to give them a little time for them to pass through, trying to convince him, that his counterpart on Earth-38 is one of Kara's best friends, and he would do anything for her. The general refuses. Later, Alex tries to find a gun, intending to go it alone to save her sister. Sara finds her and swears Alex that they will not let Kara die, and encourages her to trust her instincts and reveals how she always wants to return to her former lover, Nyssa, but hasn't. But she gives Alex her support in saving Kara, telling her that she is part of her team now. Eventually, Ray and Leo, who are lovers, manage to convince the General to give them the time they need to pass through the breach. The heroes put up a daring plan to infiltrate the facility, as Oliver can impersonate the Führer.
On Earth-1, the surgery is about to begin and Overgirl is put into a hibernation, while Kara is being kept awake. As Thawne begins, the power goes out. Dark Arrow orders a sweep. Felicity and Iris have managed to use the Time Vault computer to turn off the power. As the Nazis sweep the Labs, the women sneak to the medical room and free Kara. They try to take her outside to recharge, but all exists are blocked, forcing them to hide.
On Earth-X, Leo infiltrates the breach facility with Oliver and Oliver uses his appearance to trick the Nazis. He meets with the Sturmbannführer and Oliver witnesses as the Nazis send their secret weapon to Earth-1, the Wellenreiter, Earth-X version of the Waverider. Oliver had to let it go as to not blow his cover. Meanwhile, Sara, Alex, Stein and Jax sneak in to the facility, while Barry and Ray are ready to provide support. However, General Schott backs away on his promise and sends the Red Tornado to attack and destroy the facility, forcing Barry and Ray to take care of it before it reaches the facility. Sturmbannführer suspects Oliver is not the Führer, and puts him into a test: to kill a jew, who shared her rations with other prisoners in the camps. The jew is Felicity's Earth-X counterpart. Oliver tries to shoot the Sturmbannführer, but the gun is empty. With his cover blown, Oliver assaults the Nazis, and Alex and Sara engage the Nazis alongside Firestorm. Oliver defeats the nazis and gives a machine gun to Felicity's doppelgänger, encouraging her to escape. Oliver joins others, and the Nazis send everyone they have to fight the heroes.
On Earth-1, Thawne discovers, what Felicity and Iris did, and they and Kara are eventually found. As Felicity encoded the sequence to restore power, Thawne tries to make her tell. Felicity holds strong, but Thawne threatens to kill Iris, unless she gives the code. Kara, unwilling to let any of her friends get hurt, surrenders and tells Felicity to reveal the code, on the condition Thawne and Dark Arrow spare the others. In tears, Felicity reveals the code, and Kara is taken back for the surgery.
The fight on Earth-X keeps going. To activate the breach, two controllers must be used. Stein coerces Jax and him to separate, as he thinks they have a better chance to succeed like that. Jax manages to hotwire his end, but Stein gets pinned down by Nazi gunfire before he can reach the other device. Oliver, Sara, Alex and Leo take out many Nazis, but more come, while Barry and Ray attempt to deal with Red Tornado, eventually succeeding. Stein tries to run to the controller, but he is shot in the back by Sturmbannführer. The episode ends as Stein begins to bleed.
- This is the first episode of the series to not feature Jesse L. Martin (Joe West).
- Wally West does not appear in this episode, nor is he credited.
- When Harry is imprisoned in the pipeline, he begins throwing a ball against the wall of his cell. This could be a nod to The Great Escape, where Steve McQueen's character does the same in his cell.
- Harry exclaims, "Rip van Ramon awakens" when Cisco wakes up, a reference to the short story Rip Van Winkle by Washington Irving in which the character falls asleep for 20 years.
- Seeing the operation Kara was about to undergo, Felicity warns Iris that Kara "only has few hours before they go full Mengele on her". This is a reference to Josef Mengele, the Nazi doctor nicknamed "Angel of Death" due to his various inhumane experiments on the victims at the Auschwitz concentration camp.
- When traveling through the air conditioning vents, Felicity quips to Iris, "Lead the way, McClane", referencing an iconic scene in the 1988 film Die Hard in which protagonist John McClane does the same.
- While the Sturmbannführer is talking to Sara Lance, the song "Edelweiss" is heard in the background. This is a reference to The Sound of Music, which takes place in 1930s Austria pre-World War II. It may also be a reference to The Man in the High Castle, which primarily deals with a Nazi-controlled alternate Earth and uses a cover of "Edelweiss" in its opening credits.
- The slogan that appears at the front of the concentration camp where the heroes are detained, "Arbeit macht frei", means "Work shall set you free". The slogan appeared on the gates of Auschwitz and other real-life Nazi extermination camps.
- The Citizen Cold suit is very similar to the one worn by his comic counterpart, Captain Cold.
- Barry quotes Leonard Snart's rules to making a plan: "Make the plan. Execute the plan. Expect the plan to go off the rails. Throw away the plan." Snart previously told Barry this in "".
- Iris tells Kara, "Come with me if you want to live", referencing the catchphrase from the Terminator franchise.
- The password Felicity gives to Thawne is "Latte Ada Jonas 11900"; "Latte" could refer to the first time she and Oliver met in "" when his terrible excuse for why he needed her help was that he spilled a latte on his bullet-ridden computer, "Ada" could refer to Ada Lovelace (the mother of computer science) or the programming language named for her, "Jonas" is Oliver's middle name, and "(0)11900" is the HEX color code for a shade of green.
- At the beginning of the episode, Eobard tells Kara that he had hated every minute he spent working at S.T.A.R. Labs despite having stated in "" that he had grown to love working with Team Flash during his time there.
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