It seems a little weird that a show about a bunch of aliens integrating on Earth would focus primarily on something as culturally specific as Valentine's Day, but that's what Supergirl did! The show also used the opportunity to introduce one of Super-canon's best villains: Mr Mxyzptlk. But the fifth-dimensional imp/British man wasn't the episode's best surprise guest.
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The CW/DC Universe has already handled some of the weirdest sides of world of DC Comics -- but you have to admire its gung-ho desire to bring some of its most bizarre concepts to the big screen. Arrow did Ragman, Flash got Grodd and now Supergirl is getting everyone's favourite wanderer of the fifth dimension, Mr Mxyzptlk.