A robot sparring adversary that Superboy creates at the behest of Carl "Moosie" Draper, a classmate of his at Smallville High School in his identity of Clark Kent. Kator, clad in a green and yellow costume, is created as a means of developing and honing Superboy's abilities in combat, and possesses a host of superhuman powers that roughly approximate those of the Boy of Steel. Kator can only be destroyed with a specially designed "safety cutoff switch" that Superboy gives to Jonathan Kent as a last resort in case the hero is unable to defeat the robot.
Kator, however, develops a malevolent artificial intelligence, and almost kills the Boy of Steel before being destroyed. However, the robot apparently gives it's identity and powers to Draper before it's destruction. Draper (as Kator-Two) then engages Superboy in combat. However, Jonathan Kent presses the safety switch on the "cutoff" device, which removes "Kator-Two's" super powers from Draper, and Superboy later removes the memory of Draper ever having been Kator-Two (NSB No. 17, May 1981: "To Fight the Unbeatable Foe"; NSB No. 18, Jun 1981: "Superboy's Do-It-Yourself Doom").