It's Valentine's Day, and Kara finds herself dealing with the amorous advances of Mxyzptlk, a fifth-dimensional being with unlimited magical powers. Meanwhile, Alex discovers that Maggie hates Valentine's Day, while an alien woman hits on Winn.

Alex refuses to obey Hank's orders to stand down and sets out to find Cadmus and protect Jeremiah. Meanwhile, Kara takes drastic steps when Snapper refuses to publish her story intended to protect the remaining aliens on Earth from Cadmus.