#OnThisDay in 1961 #JaxUr debuted in #AdventureComics #289 #KryptonianScientist imprisoned in #ThePhantonZone after destroying #Wegthor #aPopulatedMoonOfKrypton while experimenting with #NuclearWeaponry #Superboy meets him when he escapes to
Earth & tries to pass himself off as #PaKent w superpowers