Invisible Kid is Lyle Norg, a member of the Legion of Super-Heroes in the 30th Century. Born on the planet Earth, he developed a serum that allowed him to become completely invisible. This made him an important member of the Legion Espionage Squad. Norg was killed by Validus of the Fatal Five. His successor is Jacques Foccart, who drank Norg's serum to save the world from Computo.
In Reboot Legion continuity, Lyle Norg survives and is romantically involved with Chemical King. There is also a version of Jacques Foccart who becomes a government spy. In Prime Legion continuity, Lyle Norg is known for struggling with his father who is in the Science Police. Invisible Kid was created by Jerry Siegel and Jim Mooney, first appearing in Action Comics #267. (1960)