His counterpart on Earth-Two was known only as the Light, although later he assumed an alter ego of the Unknown. And really, that latter name sums up how much is known of this arch-criminal. During his first scheme, the Light developed a light beam that generated heat of such intensity it shrunk any caught in its rays. This drew him into conflict with the Justice Society member Starman, who thwarted this and two other plots of the villain. Employing an advanced submersible and mutated octopus, and later utilizing time-travel technology and science from the future, the Light alongside his Octopus League nearly claimed victories each time. During his last recorded foray into crime, the Light as the Unknown stole a time traveling machine and journeyed two thousand years into the future to recruit a superhuman army to conquer his native 20th century. Once more, Starman defeated both this army and an electro-cannon from that same distant era, leading to the Light's lasting defeat.
Superman and Medusa
9 hours ago