History: Duplicate was born a mutant due to his parents exposure to an atomic detonation. He and four other mutants born under similar circumstances were adopted by Lallorian medical authorities and trained in using their powers. These Heroes of Lallor were exiled from the planet when Prime Minister Vorr decided they were a potential threat to his rule. The Jungle King offered them sanctuary on Earth, but then duped them into fighting the Legion of Super-Heroes. The Heroes of Lallor and the Legion soon realized Jungle King was their true enemy and defeated him. The Heroes were invited to return to Lallor. Duplicate Boy was hesitant about returning to Lallor because he'd fallen for Legionnaire Shrinking Violet.

(Action Comics I #381) - The Legion closed shop for the night, with Brainiac 5 staying behind for night duty. Karate Kid walked home, Saturn Girl and Lightning Lad went to catch a 3-D movie and Chemical King offered to give Phantom Girl, Ultra Boy and Matter-Eater Lad a ride home so he could show off his new air-car. Matter-Eater Lad had him drop him off a while away from home because he didn’t want his fellow Legionnaires, who lived in expensive upper level units to see that he lived in the lower level slum with his parents. Matter-Eater Lad got into an argument with his parents because his father Rall spent his entire pension and most of Matter-Eater Lad’s Legion check on his gambling habit, and decided to leave home. He walked back to the Legion Clubhouse where he found Shrinking Violet, who’d replaced Brainiac 5 on night duty when he’d been called away on a mission. She was obviously distraught, and she explained that she’d fallen for Duplicate Boy, and started dating him, but they rarely got to see each other because they lived five million parsecs apart and were often on missions for the Legion or the Heroes of Lallor respectively. They had a date that night, but Duplicate Boy never showed up and Violet felt lonely. Matter-Eater Lad decided to spend his Legion check and ask her out on a date. Princess Projecta offered to relieve Violet of night duty, and help her get snazzed up for her date. Over dinner Matter-Eater Lad told her about the problems in his home life, but she said she couldn’t offer advice and had to figure out how to cope with things himself. After dancing  at the Top of the Towers they returned to the Clubhouse, and shared a kiss. Duplicate Lad, who’d missed his date with Vi because he was on a mission, was observing her with his telescopic vision and appeared on Earth, threatening to crush Matter-Eater Lad. Matter-Eater Lad told him that if Violet loved him nothing he did would change that, and beating him up solved absolutely nothing. Duplicate Boy realized he was right and calmed down, and Violet told Duplicate Boy she still loved him, she was just lonely. The next day Matter-Eater Lad agreed to move back home after his father promised to stop gambling.

Duplicate Boy was unable to rescue Shrinking Violet when Yera, a Durlan spy, took her place on the LSA. This failure brought an end to Duplicate Boy and Violet's relationship.

Due to the events of Zero Hour Duplicate Boy's existence was erased from DC continuity.

Comments: Created by Edmond Hamilton & John Forte. 

Duplicate Boy received profiles in Who's Who: The Definitive Directory of the DC Universe #7 and Who’s Who in the Legion of Super-Heroes #3.

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