- "Kara, sweetest, like I said, I'm your one true love, your soulmate, your one true pairing, as the kids say. My name is Mxyzptlk and I love you, Kara Zor-El. [Kara: Uhh..] Tell me, will you marry me?"
- —Mxyzptlk proposes to Kara Danvers
When Mr. Mxyzptlk, a magical imp, shows up on Earth and declares his love for Kara, she tries to let him down easy, thinking him harmless. However, he decides it's a challenge and starts to wreak havoc on National City. Mon-El has seen beings like Mr. Mxyzptlk on Daxam and knows how dangerous they can be. He and Kara argue over how to get rid of Mr. Mxyzptlk, further straining their relationship. Meanwhile, Alex and Maggie celebrate their first Valentine’s Day together.
- This episode is a loose adaptation of Supergirl and Mr. Mxyzptlk's first meeting in Action Comics #291: The Bride of Mr. Mxyzptlk! (August, 1962). In that story, Mr. Mxyzptlk tried to coerce Supergirl into marrying him using his magic.
- Mxyzptlk tries to serenade Kara by briefly singing "A Whole New World" from Disney's Aladdin.
- Mxyzptlk's attempt at shooting the armed robbers with their own guns is a direct reference to a scene in the first entry in the X-Men film series, further driven home by Mxy saying he "saw this in a movie once".
- Mxyzptlk's idea of a duel in the theatre is a direct reference to the musical Hamilton, in which the protagonists Alexander Hamilton and Aaron Burr duel with pistols, the latter taking the former's life (a fact referenced by Mxy referring to Mon-El as Hamilton).
- Additionally, Mxyzptlk suggests that Mon-El not "throw away [his] shot", further referencing the third song of Hamilton, "My Shot".
- Supergirl's line "You wanna get nuts? Let's get nuts!" is taken from the 1989 Batman film.
- Mxyzptlk calling Kara a "nasty woman" is possibly a reference to the Presidential debate between Hillary Clinton and Donald Trump that took place on October 19, 2016, during which, Trump called Clinton a "nasty woman".
- The Fortress of Solitude Atomic Cauldron has previously appeared in Superman and Supergirl lore: In Action Comics #402: Feud of the Titans! (July, 1971) which features both Kryptonian cousins, and in Supergirl story Daring New Adventures of Supergirl #12.
|Supergirl season 2|
|"The Adventures of Supergirl" • "The Last Children of Krypton" • "Welcome to Earth" • "Survivors" • "Crossfire" • "Changing" • "The Darkest Place" • "Medusa" • "Supergirl Lives" • "We Can Be Heroes" • "The Martian Chronicles" • "Luthors" • "Mr. & Mrs. Mxyzptlk"|
|"Homecoming" • "Exodus" • TBA • TBA • TBA • TBA • TBA • TBA • TBA|