Kodama was born on planet Earth in the 30th century. He was dubbed the "Sun Killer" after taking the light from the cold world of Orivan. At some point, he became a servant of the villain Saturn Queen and pledged to free her should she ever become captured. Like his mistress, he has a disdain for the Legion of Super-Heroes. Sun Killer is able to generate solar energies of all types of stars, including that of a red sun in order to rob Mon-El of his Daxamite abilities.