Klax-Ar

A Kryptonian refugee and exiled citizen who seeks 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 tried to transfer Superboy's powers to him but Superboy tricked him by sending a Superboy robot in his place with Klax-Ar to outer-space.(SB No. 67, Sep 1958: "The Man Who Destroyed Krypton!")

Later, Klax-Ar short-circuited the Superboy robot and used its parts to construct the space-sled. While in space Klax-Ar sees Supergirl while she is traveling to the planet Kronis, and attacks her with the space sled and his Mentomatron helmet, but he is once again defeated when Supergirl leads him into the polluted Earth atmosphere, which made it impossible for Superman's robots to function, also renders his sled useless by effectively destroying the robot's delicate circuits, she then kicks his useless sled to Midvale (SF No. 187, Jan/Feb 1978: "Birthright of Power!").