A member of the Legion of Super-Heroes in the 30th century (first appearance: Act No. 267/2, Aug 1960: "The Three Super-Heroes"). Lyle Norg's power is invisibility, an ability the Earth boy bestows upon himself after inventing a serum. He is also member of the Legion's Espionage Squad and is elected Legion leader for a term.
An alternate version of Ultra Boy is encountered by Superboy when the Boy of Steel is hurled to a different reality after an alien sun goes nova. Upon his arrival in the parallel (and mis-spelled) "Smallvile", Superboy meets the counterparts of five members of the Legion of Super-Heroes: Brainiac 5, Chameleon Boy, Element Lad, Ultra Boy, and Invisible Kid - who in this universe are evil. During this encounter, the five delinquents attempt to expose Superboy's secret identity as Clark Kent. Superboy, after realizing what they are up to and that he is in fact on a parallel Earth, is able to contact his counterpart, who has been away on a mission. The two Superboys assist each other in thwarting the criminals' efforts and, after apprehending them, return the villainous Legionnaires to their own time (SB No. 117, Dec 1964: "Superboy and the 5 Legion Traitors").
(See also Invisible Kid (Jacques Foccart))