Gim Allon, also known as Colossal Boy, Leviathan, and Micro Lad, is a fictional character in the 30th and 31st centuries of the DC Comics universe who has gone by a variety of superhero names over the past several decades, although originally (and most commonly) Colossal Boy. He is a member of the Legion of Super-Heroes. He first appeared in Action Comics #267 (August 1960). In the 1990s, the entirety of the Legion of Super-Heroes were changed in what was referred to as a "reboot" of those characters' continuity, including Allon. Later on, these superheroes were again restarted in what has been referred to as the "threeboot" of the Legion of Super-Heroes.