Gim Allon

While training as a Science Police officer on Mars, Gim Allon was struck by the emanations of a nearby meteorite impact, gaining the power to grow to enormous size and strength. He went on to join the Legion of Super-Heroes under the name Colossal Boy.

Few Silver Age debuts have shown the staying power of Gim Allon, who first burst onto the scene in Action Comics #267 back in 1960, conjured by the imaginative pairing of writer Otto Binder and artist Wayne Boring. Over an extraordinary span stretching across 66 years, he's remained a fixture of DC's far-future corner of the universe, racking up 92 catalog appearances and nine collector-significant key issues — a testament to how deeply he's embedded himself in Legion lore. His adventures unfold most prominently across Adventure Comics, Legion of Super-Heroes, and Tales of the Legion of Super-Heroes, where he keeps remarkable company: Reep Daggle, Saturn Girl, Imra Ardeen, Brainiac 5, and Garth Ranzz are among the luminaries sharing his pages. If you love the grand, optimistic sweep of Silver Age science fiction and the rich ensemble storytelling that made the Legion of Super-Heroes a generational obsession, Gim Allon is absolutely worth your time.