"Supergirl" fans will be in for a bizarre Valentine's Day when the thirteenth episode of Season 2 airs next Monday. In "Mr. & Mrs. Mxyzptlk," Mr. Mxyzptlk (portrayed by guest star Peter Gadiot) falls in love with Kara Danvers/ Supergirl (Melissa Benoist).

According to CarterMatt, Mr. Mxyzptlk, "[o]ne of the most infamous Superman villains," will be wreaking havoc in National City. The official synopsis for episode 13 of "Supergirl's" second season reads, "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 (Chris Wood) 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 (Chyler Leigh) and Maggie (Floriana Lima) celebrate their first Valentine's Day together."

The promo for "Mr. & Mrs. Mxyzptlk" feels like a rom-com movie gone wrong. It opens with Mr. Mxyzptlk dramatically declaring his love for Kara, and the latter is magically dressed in a wedding gown in the next scene. She angrily asks him if he has lost his mind.

However, the video transitions to Supergirl suited up and elbowing the baddies, then Mr. Mxyzptlk is once again shown gleefully causing chaos in National City. Supergirl is also shown locking lips with someone, and the last scene appears to show Superman... but when he turns around it is Mr. Mxyzptlk in a Superman suit. Once again Supergirl is infuriated with his antics. "Supergirl's" thirteenth episode, Mr. & Mrs. Mxyzptlk," will air on Monday, Feb. 20 at 8 p.m. EST on the CW, per ComicBook.

Den of Geek has also revealed that the correct pronunciation of Mr. Mxyzptlk's name is "mix-yez-pitel-ick." The character "has been around since 1944" and was created by Jerry Spiegel, who was also the co-creator of Superman. He's not an outright villain, although he does love causing mischief for our caped heroes. Watch "Supergirl" Season 2 Episode 13 promo below.