Klax-Ar

A Kryptonian refugee and exiled citizen who sought to steal the super-powers of surviving Kryptonians in order to replace his own absent powers.

Originally Klax-Ar destroyed his super-powers through exposure to atron-rays. He traveled to Earth and attempted to transfer Superboy's powers to him but the Boy of Steel tricked him by sending one of the Superboy Robots with Klax-Ar to outer-space in his stead. (SB No. 67, Sep 1958: "The Man Who Destroyed Krypton!")

Later, Klax-Ar short-circuited the Superboy robot and used its parts to construct a space-sled. While in space, Klax-Ar saw Supergirl while she was traveling to the prison planet Kronis, and attacked her with the space sled and his Mentomatron helmet. However, he was once again defeated when Supergirl led him into the polluted atmosphere of Earth, which made it impossible for Superman's robots to function, and, since the space-sled was constructed from parts taken from the Superboy robot, rendered his sled useless by effectively destroying the robot's delicate circuits. Supergirl then kicked the useless sled to Midvale. (SF No. 187, Jan/Feb 1978: "Birthright of Power!")