Supergirl To Explore Maggie Sawyer's Backstory

In this Monday's "Mr. and Mrs. Mxyzptlk" episode of Supergirl, Alex Danvers (Chyler Leigh) and Maggie Sawyer (Floriana Lima) will be celebrating their first Valentine's Day together. Alex, who often tries to hide her emotions, is thrilled that she gets to spend the romantic holiday with her girlfriend; however, Maggie views it as nothing more than a made-up holiday designed to sell cards, candy, and jewellery. That puts a major damper on Alex's excitement, leading to their first real fight. But don't fret, you can count on them making up by the time the credits roll.

Aside from that, the episode will also gives us a taste of Maggie's backstory. That'll setup a future episode that will delve even deeper into the pre-Alex life of the sweet and tough NCPD police detective.

"There's a storyline coming up where it's not really about Alex and Maggie's relationship," Executive Producer Andrew Kreisberg told EW. "It's more about Maggie as a cop getting caught up in an art heist."

When Mr. Mxyzptlk (guest star Peter Gadiot), a magical imp, shows up on Earth and declares his love for Kara (Melissa Benoist), 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.

Stefan Pleszczynski directed the episode written by Jessica Queller & Sterling Gates.

MORE: Supergirl: First Look at Mr. Mxyzptlk! / Supergirl Recap with Spoilers - Luthors / Lena Luthor's Secret Origin Revealed / Supergirl: First Look at Young Lex Luthor

Distributed worldwide by Warner Bros. International Television Distribution, SUPERGIRL is executive produced by Greg Berlanti (Arrow, The Flash), Ali Adler (The New Normal), Andrew Kreisberg (The Flash, Arrow) and Sarah Schechter (Blindspot, The Mysteries of Laura). Supergirl is based on the characters created by Jerry Siegel and Joe Shuster and appearing in DC Comics, by special arrangement with the Jerry Siegel Family.

"Mr. and Mrs. Mxyzptlk" episode of Supergirl airs Monday, February 20 at 8 p.m. ET/PT.