Luornu Durgo was the first person to join the newly-formed Legion of Super-Heroes after its original founders. She was then named Triplicate Girl, because she could split herself into three separate bodies, like all people from her home world, Cargg. After a few years as a reliable, stalwart Legionnaire, one of Luornu's bodies was killed by Computo the Conqueror. She renamed herself Duo Damsel and continued to function well as a Legionnaire, often participating in missions involving the Legion's Espionage Squad, of which she was a regular member.