|"Things were looking a little grim, but part of me was, admittedly, a little excited for a "reunion" of old friends."|
- "You were struck by lightning, I was given the Book. By a higher power. Both random acts of chance. This... this is my destiny. So much more than becoming the Flash was ever yours."
- "But people don't become heroes because of circumstance. They become heroes in spite of circumstance."
"You're just a cheap knock-off."
- —John Deegan, Barry Allen, and Oliver Queen
|Supergirl, the Flash, Green Arrow and Superman engage in the battle of their lives.|
- Melissa Benoist as Kara Danvers/Supergirl
- Mehcad Brooks as Jimmy
- Chyler Leigh as Agent Alex Danvers
- Katie McGrath (credit only)
- Jesse Rath as Querl "Brainy" Dox/Brainiac 5
- Sam Witwer (credit only)
- Nicole Maines (credit only)
- April Parker Jones (credit only)
- David Harewood as J'onn J'onzz/Martian Manhunter
Special guest star
- Stephen Amell as Oliver Queen/Green Arrow
- David Ramsey as John Diggle
- Carlos Valdes as Cisco Ramon
- Danielle Panabaker as Dr. Caitlin Snow/Killer Frost
- Tyler Hoechlin as Dr. John Deegan/Superman and Clark Kent/Superman
- Grant Gustin as Barry Allen/The Flash
- Jeremy Davies as Dr. John Deegan
- Ruby Rose as Kate Kane/Batwoman
- LaMonica Garrett as Mar Novu/The Monitor
- Cassandra Jean Amell as Nora Fries
- Adam Tsekhman as Gary Green
- Bob Frazer as Roger Hayden/Psycho Pirate
- Elizabeth Tulloch as Lois Lane
- Claudia Yuen as Young Woman
"Elseworlds, Part Three" begins following the previous evening's occasions. The rendition of Superman — Deegan, who's acting like the Man of Steel — they experience uncovers that The Monitor talented him the Book, permitting the Man of Steel to revamp reality. The different sides nearly battle until Oliver makes an approach to escape.
In this new reality, we see that Superman's assumed control over STAR Labs, where John Diggle and Caitlin Snow work. Superman shows up at the nest and is disturbed Barry and Oliver escaped. superman goes into the pipeline, where Kara's being held hostage. Kara gives breaking a shot of the office until Alex Danvers shows up and utilizes a sonic-based gadget to immediately render her weakened.
Barry and Oliver choose they need to attempt to find Cisco with the goal that he can help them vibe to Earth-38 and locate the genuine Superman. They show up at Cisco's loft and when they go in, they're apparently shipped to another reality where The Monitor is standing by to welcome them. The two are provoked with a proposal to enable the Monitor to confront the more noteworthy danger he recently talked about yet they decline. He transports them once more into the truth that Deegan has made.
The team concludes that since in this reality that heroes have turned terrible, they trust Cisco is most likely "awful" in this reality too. Utilizing Barry's mastery, the two plunge on a nearby watering opening where hoodlums run of the mill hang out. There, they discover Gary as a bartended and unearth Cisco, who's clearly a medication boss in the truth. Cisco's essential colleague is James Olsen.
A fast battle breaks out among Barry and Oliver and Cisco's partners in crime before the two uncover they know Cisco's sibling. Realizing that something is going on, Cisco maneuvers them into the back room. There, Barry reveals to him that they can show Cisco how to utilize his forces to transport them to different Earths.
Kara's despite everything detained while Alex and Caitlin have a discussion quickly outside her cell. Alex uncovers that she's straight in this reality and Caitlin discloses to her that she'll assume control over her work day for the rest of the night.
Cisco's ready to utilize his forces to transport the two to the Fortress of Solitude on Earth-38, where they illuminate him regarding the truth change on Earth-1.
Kara's despite everything attempting to stand out enough to be noticed and uncovers a youth mystery and Alex understands that a major issue with's the whole circumstance. Alex discharges Kara from her cell and on out, the pair runs into Deegan, Diggle, and Caitlin. He's going to utilize his laser vision to char the sisters when the legends from Earth-38 vibe back in and prevent him from doing as such.
The two adaptations of Clark Kent take off to battle one another and Alex tells Barry and Kara she'll lead them to Deegan's Book. Kara cannot modify reality herself so she takes the Book to Clark. Together, Clark and Kara beat Deegan and Clark starts to revise reality utilizing the book.
Everybody's forces return and Barry velocities to where Kara and Clark are. Deegan flies back in and begins stifling Barry out until Clark closes his world revise. Deegan can take off with the Book, leaving Barry healthy.
Deegan starts modifying reality and Barry notice that in the event that he and Supergirl travel far and wide inverse ways at Mach 7, they'll hinder time enough to get the book from Deegan. Superman attempts to stop them by saying that he saw the pair kick the bucket in the book, yet they race off to proceed in any case.
Oliver returns to the high rise where the met The Monitor. There, Oliver stands up to The Monitor, requesting that he help spare Barry and Kara, namedropping the Crisis all the while. The Monitor asks Oliver how he would propose they keep the parity.
Superman discovers Deegan and the last can bring Amazo into this reality. Amazo blows Superman back and Lois vibes onto the scene with Brainiac-5 and Martian Manhunter.
Barry and Kara start to race far and wide while the battle between the Earth-38 legends and Deegan proceeds. We see time start to back off as Kara and Barry's faces fire illuminating as occurred in Superman's vision of things to come. Similarly as they're going to explode, Oliver shows up on-scene and utilizations a bolt to shoot the Book out of Deegan's hands. Deegan's before long devoured by the vitality of the book.
The gathering assembles at STAR Labs and sends the Earth-38 saints back home. There, Clark and Lois reveal to Kara that they're having a child. In light of the Kryptonian idea of the pregnancy, Clark tells his cousin that he and Lois will be moving to Argo on an increasingly changeless premise.
Soon thereafter, Clark proposes to Lois in the Fortress of Solitude.
Barry and Oliver go out for a beverage back on Earth-1. The two offer a genuine second about the genuine importance of bravery. As theey state a toast, Oliver's telephone begins going off. He answers and it's Batwoman. Kane educates Oliver that Deegan's made a companion in Arkham. There, it's uncovered that Deegan and Psycho-Pirate are cell neighbors.
- This is the first episode of the series to not feature Sam Witwer (Ben Lockwood) after signing on as a series regular.
- The episode was previously titled "Elseworlds: Hour Three".
- This is the first Supergirl episode to include Lois Lane, as she was previously only mentioned in earlier seasons.
- The opening monologue in this episode was narrated by John Deegan. But for the last line, he says it after transforming into Superman.
- Oliver uses a Kryptonite arrow, similar to what he did in ""
- Near the end, Deegan's face is shown disfigured in black and white almost like a skeleton, similar to his comic book counterpart's appearance.
- After The Monitor tells Barry and Oliver that Earth-1 might have a chance to prevent the crisis, Barry says "If that's supposed to be a pep talk, I've had better." This is a reference to the many incidents on when Barry was given a pep-talk that helped him solve a problem.
- When John Deegan becomes Superman and rules the Earth, this is a reference to the plot of the video game Injustice: Gods Among Us where Superman is a tyrant that rules the Earth.
- When Deegan fought Superman in a building, a civilian calls him "Bizarro". This is a nod to Bizarro, who is female in the Arrowverse.
- Kara correctly guesses that Lois and Clark are having a baby, a reference to Jonathan Samuel Kent, who first appeared in DC Comics' Convergence event in the miniseries Convergence: Superman #2 (July 2015). Jonathan is the biological firstborn son of Superman/Clark Kent and Lois Lane and is half Kryptonian/human.
- The fact Superman is taking Lois to Argo in order to safely carry the child (with kicking in the womb being mentioned a specific risk) is a callback to longstanding fan speculation over the logistics - and even impossibility - of superpowered Clark and human Lois having a child or simply a sexual relationship. The best known example of this is science fiction writer Larry Niven's classic essay, "Man of Steel, Woman of Kleenex".
- Gary says Oliver and Barry are his heroes, "Legends", a reference to , where he is a recurring character.
- While in the Fortress of Solitude, Superman presses a piece of coal into a diamond to put it in a ring and propose to Lois Lane, resembling Smallville's 100th episode ("Reckoning"), when Clark Kent did the same to propose to Lana Lang. The aforementioned scene itself is a reference to Superman III, when Superman presses a piece of coal to give Lana Lang a ring after she tells him she has to sell hers.
- Superman says to John Deegan as Superman, "doctor, can I have a word?", a similar quote to Superman II, when he says to Zod, "General, would you care to step outside?"
- One of the scenes of S.T.A.R. Labs shows it to be under Nazi control with a red sky, a possible nod to the previous crossover event, .
- This episode introduced the Earth-1 doppelgängers of James Olsen and Alex Danvers.
- The crossover ends with the title of the next crossover, , which premiered in the Fall of 2019.
- At the end of this episode, Roger Hayden says "Worlds will live. Worlds will die. And the universe will never be the same." Psycho Pirate said the exact same thing in the comic book crossover Crisis on Infinite Earths.
- Moreover, in "", the future newspaper from 25 years after his disappearance that Nora shows to Barry had written that Roger Hayden claimed to remember the night's true events and upon his arrest said, "Worlds lived. Worlds died. Nothing will ever be the same."
- Flash and Supergirl dying in Superman's vision of the future is a reference to the original Crisis on Infinite Earths story-line, where both heroes sacrifice their lives to save the universe.
- The scene where Oliver makes a deal with Mar Novu is similar to the scene where Oliver makes a deal with Samanda Watson in "".
- Barry and Oliver having a drink in the ending scene is a nod to the ending of "".
- When Barry asks Oliver to hug him, he rudely responds "no" as he made him hug him twice, referring to the episodes, "" and "".
- In trying to track down the Cisco Ramon of the new reality, Barry tells Oliver that the last alternate version of Cisco he met wasn't very helpful, likely a reference to the version of Cisco that existed in the Flashpoint timeline, a business magnate with very little interest in metahumans and crime-fighting.
- Lois reveals to Clark that she and him are expecting their first child together. In reality, Elizabeth Tulloch was six months pregnant while shooting the Elseworlds crossover at the time.
- Supergirl says to Flash, "this is becoming an annual thing," referencing the crossover events from the previous two seasons.
- Barry says that they can slow the rotation of Earth if they travel around the world at Mach 7. That's approximately 5371 MPH. The circumference of the Earth (at the equator) is approximately 25,000 miles. It would take about 4.5 hours at that speed to make one revolution. Yet, in the scenes, we see them traveling the distance in less than a second.
- While Flash and Supergirl are running and flying around the globe at "mach 7" to slow down the earth, they would need to be traveling in the same direction. However, you can clearly see they are going in opposite directions during these segments.
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