Gim Allon is Colossal Boy's real name. While vacationing on Mars, he was exposed to the radiation of a strange meteor, giving him the ability to grow to enormous size. The largest size recorded that Colossal Boy has grown in 4000 feet, but he generally grows to 60 feet. He also has super strength. Colossal Boy joined the Legion at the same time as Reep Daggle, dubbing him with the name Chameleon Boy.

Colossal Boy was romantically involved with Shrinking Violet. Their relationship was shattered when Violet was kidnapped and held hostage, while her place was taken by a Durlan. Gim and the Durlan fell in love and were married.

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