Duplicate Boy was a member of the Heroes of Lallor, he was one of the five born with super-powers as a result of a nuclear accident on the planet. He was raised alongside the other four mutants by the government, only to be banished for disobeying the dictatorship of the planet. Later Duplicate Boy and his four teammates were tricked into battling the Legion of Super-Heroes by Dr Marden King, a relative of Jungle King, whose death he blamed on the Legion.