Gim Allon(Colossal Man: Adult Legion timeline)

In the 30th century, teen-aged Gim Allon of the planet Earth became the hero named Colossal Boy. As an adult, he assumed the name Colossal Man. He was a member of the adult Legion of Super-Heroes in the "Adult Legion" timeline. Gim quit the Legion when an injury robbed him of his growth powers.