"Mxyzpixilated" is the eighth episode of the second season of Superman: The Animated Series, and the 21st of the overall series. It depicts the appearance of Mr. Mxyzptlk in Metropolis. Superman suddenly finds himself getting tormented by an imp with powers so great they can only be called magic. When the imp gives Superman a rule for his leaving for 90 days, Superman manages to beat him at every turn.