Lyle Norg, the first Invisible Kid, was a scientific genius who invented a serum to make himself invisible. He was one of the earliest Legionnaires, joining at the same time as Chameleon Boy and Colossal Boy. In an early adventure, he saved the life of Jan Arrah, aka 'Mystery Lad', who later became known as Element Lad.
Lyle was a permanent member of the Legion's Espionage Squad.