Kar-Lu was a twelve-year-old boy from Krypton who was distinguished by the fact that he did not wish to receive the customary citizen training as required by all Kryptonians. At fifteen, he became a surveyor and hired a partner named Jan-De. The two embarked on an expedition to the Eiu Sea. During the journey, they came upon a group of criminals set on taking control of the capital city of Kandor. Without citizenship training, Kar-Lu was ill equipped to deal with the threat. Fortunately for him, Jan-De had long since acquired his headband of citizenship and used his skills to save Kar-Lu and himself from their adversaries. After this adventure, Kar-Lu returned to Kandor and applied for citizenship.