She’s become the object of his crazy affections and in order to give him a real shot, the producers decided to update his costume from “small cartoon man in orange” to “CW handsome.”
Supergirl is pretty good when it comes to dealing with supervillains that can shoot lightning or blast kryptonite out of their chest, but Kara might have here hands full with Mr. Mxyzptlk.
An interdimensional being with a name that’s a pain in the ass to type and the powers to basically do anything, he’s got his sights set on Kara, and not in a super great way.