Mr. Mzxyptlk

Superman v1 #30
Superman #96
World's Finest #113
Superman #174, 283, 349
Action Comics #583
Superman v2 #11
Adventures of superman #441
Action Comics #721
Superman Man of Steel #56, 75
Batman and Superman World's Finest #6
New year's evil Mr. Mxyzptlk
Superman and Batman World's Funnest
Superman Secret Files and Origins 2004
Adventures of Superman #630, 634, 638, 646
Countdown to Final Crisis #23
Superman Adventures #6, 16, 26, 38, 40, 41