When Mr. Mxyzptlk, a magical imp, shows up on Earth anddeclares his love for Kara, she tries to let him down easy,thinking him harmless. However, he decides it's a challengeand starts to wreak havoc on National City. Mon-El has seenbeings like Mr. Mxyzptlk on Daxam and knows how dangerous theycan be. He and Kara argue over how to get rid of Mr. Mxyzptlk,further straining their relationship. Meanwhile, Alex andMaggie celebrate their first Valentine's Day together.