Kara learns Mon-El's true identity, while Winn is suspected of stealing a Van Gogh and finds out he's been set up by his girlfriend, Lyra.
Tropes in this episode include:
- Abusive Parents: Hinted and downplayed. While Rhea and Lar Gand are delighted to reunite with Mon-El, it becomes clear later on that they are more interested in having him become a figurehead leader of the "new" Daxam than just being with him.
- And Starring: Teri Hatcher gets the "Special Guest Star" citation, while Kevin Sorbo gets a "With" in the regular guest stars lineup.
- Bait the Dog: The "prince" that saved Mon-El seemed likeable in his first appearance, but he did some evil acts to save Mon-El.
- Be Careful What You Wish For: Near the end of the episode, Kara complains that she could definitely use an inter-dimensional vacation. What she doesn't realize is that she'll get it in the form of a musical Crossover with The Flash (2014).
- Bread and Circuses: According to Kara, the reason why Daxam was such a party planet was because the royal family needed to keep the population too drunk to notice they were being oppressed.
- Call-Back:
- The alien gangster Mandrax is one of the Fort Rozz escapees.
- Mon-El's parents mention being tipped off by a Dominator ambassador on Slaver's Moon, which happened in "Supergirl Lives."
- Kara's Fantastic Racism comes back into play big time. Considering that she is dealing with both Mon-El's lie and two Daxamite rulers who believe that their servants were happy, it's understandable somewhat.
- Calling the Old Man Out: Done by Mon-El towards both of his parents in the end.
- Camera Spoofing: Valerians don't show up on cameras. This allows Lyra to steal the painting, while making it look like Winn is alone in the museum, acting like an idiot.
- Captured on Purpose: Music Meister allows himself to be caught by the DEO so he can get to Supergirl and her Interdimensional Travel Device.
- Casting Gag: Darren Criss, a rather gleeful one.
- Celebrity Paradox: The reference to Game of Thrones effectively does this for any actor who has ever been both on that show and in the Arrowverse (e.g. Rila Fukushima).
- Continuity Nod: Winn mentions his father's criminal background when Maggie summons him to NCPD.
- Decomposite Character: Lar Gand and Mon-El are the same person in the comics, with the former being his birth name and the latter his alias. Here, they are father and son.
- Deliberate Values Dissonance: The lifestyle of the Daxamites is once again shown without any attempt to whitewash it.
- Disposable Sex Worker: It's unclear if the woman Mon-El was sleeping with during Daxam's destruction was a prostitute or not, but she was abandoned to her fate nonetheless.
- Double-Meaning Title: The title refers to both the two pairs of Star-Crossed Lovers (Kara x Mon-El and Winn x Lyra, both of which are a case of Interspecies Romance) and Mon-El's parents, who traveled galaxies to search for him.
- Fantastic Racism: While Mon-El's parents display the expected bias against Kryptonians, Kara falls back into her opinion of Daxamites rather easily and takes it out on him.
- Foreshadowing: At the beginning of the episode, Mon-El talks with Kara about musicals and Kara's love for them. In The Flash, she and Barry would live in a musical.
- Foil: Kara and Winn. Both were lied to by their significant others, and both spend most of the episode trying to decide whether or not to forgive them. Winn is able to do so because Lyra only used him to save her brother. Meanwhile, Kara is firm on not forgiving Mon-El for his lies after he admits that he wasn't sure that he was ever going to confess the truth.
- Graceful Loser: Several episodes show the Daxamites hunting for Mon-El. When they find him, they start making threats if he isn't returned. Upon eventually finding that Mon-El refuses to assist them in rebuilding Daxam or be the prince again and wants to stay on Earth, instead of an expected confrontation that these sorts of plots tend to turn into, Lar Gand essentially shrugs and teleports him back down, although Rhea, at least, seems a little surprised that her husband doesn't even put up a fight.
- Happiness in Slavery: Lar Gand and Rhea are convinced that their slaves loved their position and were grateful for their new lives.
- Has a Type: Lampshaded within the episode, with Winn having one for Femme Fatales.
- Hero of Another Story: Just like the last crossover episode ("Medusa"), a short intro to the story is shown and the bulk takes place on The Flash.
- Hero Stole My Bike:
- One of the darkest examples of this trope, as Mon-El's bodyguard murdered the Kryptonian ambassador to steal his pod for Mon-El.
- Even harsher, the Kryptonian ambassador was wearing the Sigil of the House of El. In other words, he was a relative of Kara's.
- I Choose to Stay: Mon-El refuses to leave for Daxam with his parents, as he feels they will just make Daxam what it was and he wants nothing to do with that.
- I Have Your Wife: Lyra has to steal "The Starry Night" so the art theft ring her brother was working for won't kill him.
- Infraction Distraction: Lyra thinks Winn is breaking the rules to help her escape and free her brother and thus doesn't consider the possibility the whole thing is a DEO setup to take down an entire alien gang.
- Kick the Dog: The guard who escorted Mon-El during the destruction of Daxam had several moments, first encouraging Mon-El to leave his lover behind to die, callously walking past several injured people, killing the Kryptonian ambassador to get his ship, and then having the ship take off without even considering allowing some more people to seek refuge aboard it than just Mon-El.
- Liar Revealed: A classical case, with Lyra being revealed as an art thief and Mon-El as Daxam's prince.
- Literary Allusion Title: To the prologue of Romeo and Juliet.
- Loophole Abuse: Maggie does this twice. The first is releasing Winn when she claims another detective didn't properly complete the paperwork to arrest him, giving him some time to clear his name. The second is when she notes there's no actual physical evidence linking Lyra and her brother to the previous thefts, so she chooses to officially overlook the possibility of their involvement.
- Manipulative Bitch:
- Rhea. She comes down to Earth to get Kara to convince Mon-El to come back to them, citing that there are Daxamites scattered all over the universe and that Mon-El can unite them, playing on Kara's own feelings about losing her people. She also gets to Kara by saying that she'll never forgive Mon-El and that she will always see Mon-El as less than her. This ends up working on Kara, but not on Mon-El, who rejects his parents.
- Played with in regards to Lyra. She tricks Winn into a heist, but she does it to save her brother and she does have feelings for Winn.
- Mexican Standoff: Winn holds a henchman of Mandrax at gunpoint while another henchman is pointing his gun at Lyra. It is just so the D.E.O. would arrest them.
- Mind-Control Eyes: Music Meister does this to Kara, causing her to dream about being a singer in a 1940's-era nightclub.
- Mythology Gag:
- The name of Mon-El's father is Lar Gand, which was Mon-El's real name in the comics.
- Kara excitedly calls her team "Superfriends." This doubles as a Continuity Nod to the Pilot, when she refused to let Winn call them that.
- Rhea makes a threat to Earth that is similar to the one made in Man of Steel by General Zod.
- Two Human Aliens wearing black arriving on Earth to retrieve a noble of their own people who believed himself to be the Last of His Kind so that he can rule over the survivors? Lois & Clark had a sizable story arc with the same plot.
- Negated Moment of Awesome: James's Big Damn Heroes moment, Badass Boast and all, gets cut short by Mandrax, who proceeds to manhandle him quite easily. He still gets points for trying though.Mandrax: I don't deal with human criminals. You break too easily.
Guardian: Try breaking through titanium alloy. [Mandrax No Sells his opening hit] That usually works. Run. - Nothing Personal: Said word for word by Lyra when Winn confronts her.
- Once More, with Clarity: Mon-El's flashback of his escape from Daxam is revisited, with much darker context. He had to abandon a woman he was sleeping with at the time, his guard murdered the owner of the pod he used, and he took off with the population bearing down on him in the hopes of escaping their destruction.
- One Phone Call: Mentioned by Winn during his interrogation.
- Out of Focus: James once again has the least screentime.
- Passive-Aggressive Kombat: There's no shortage of thinly veiled insults and barely contained snark being tossed around at the dinner between Kara, Mon-El, and Mon-El's parents.
- Punch! Punch! Punch! Uh Oh...: Guardian punches Mandrax and takes a moment to appreciate how much trouble he's in when it fails to do any meaningful harm.
- "The Reason You Suck" Speech:
- Kara gives several to Mon-El about both his lie and his homeworld, Daxam.
- Rhea gets in a good one about Kara's people when she is trying to get her to convince Mon-El to come home:Rhea: He has no idea how unforgiving your people can be.
- The Reveal: Mon-El is the Prince of Daxam, as was hinted at in several past episodes.
- Right Through His Pants: Both Mon-El and the woman he was sleeping with are almost fully clothed when Mon-El's guard comes to rescue him. Mon-El even appears to be wearing a belt.
- Sci-Fi Writers Have No Sense of Scale: Lar Gand says that Mon-El's incomplete signal brought them to "the right galaxy." However, Krypton and Daxam's solar system has been previously established as being only 2,000 light years from Earth, placing all of them in the Milky Way galaxy. In the same arm of said galaxy, even. Granted, that is still a long way away, but it's exponentially less distance than another galaxy.
- Shout-Out:
- Kara and Mon-El were apparently binge-watching Game of Thrones, based on Kara's comment that "winter hasn't come" over six seasons.
- When Lyra demonstrates her strength, Winn excitedly compares her to She-Hulk; amusingly enough, Lyra is the name of She-Hulk's niece and protege.
- The Stinger is just an "Oh, boy" shy of playing out just like the stinger to almost every Quantum Leap episode.
- When interrogating a man at the alien bar to find out where Lyra might be, Alex bribes him with Hamilton tickets—she also says that the actor playing King George is an alien that owes her a favor, Genius Bonus telling you that the actor is Jonathan Groff, another reference to Glee.
- Star-Crossed Lovers: As the title suggests, referring mainly to Kara and Mon-El, but also to Winn and Lyra. For added bonus, both pairs are a case of Interspecies Romance.
- The Stinger: Kara is stuck in Music Meister's imaginary world.
- This Is Unforgivable!:
- Kara feels this way about Mon-El's lie, especially after he admits he may never have confessed it if not for his parents showing up.
- Subverted with Winn and Lyra, even after she basically framed him for a robbery.
- Three-Point Landing: A falling Supergirl breaks free of the sphere she's been encased in and lands in a perfect Iron Man pose.
- Trespassing to Talk: Mon-El lets himself into Kara's apartment and waits until she gets home to apologize for lying.
- Was It All a Lie?:
- Winn asks this of Lyra after he learns she used him to steal "The Starry Night" by Vincent van Gogh. At first, she says he was just a mark, but later admits that she only used him because her brother was in trouble.
- Kara briefly wonders this about Mon-El. He insists that, aside from hiding his true identity, it was not.
- Wham Episode: Mon-El's secret is revealed to Kara: he is a Prince of Daxam. Kara breaks up with him. The episode ends with her being whammied by Music Meister.
- What the Hell, Hero?:
- Kara spends most of the episode acting like this to Mon-El for his lie about his past.
- Winn has this reaction when Lyra frames him.
