Brainiac: Earth-5

Brainiac of Earth-5 is a collector of worlds. He was able to briefly defeat Superman by injecting him with liquid Kryptonite, changing Superman's life forever. (See Superman:Earth-5) He is the smartest man in the universe who easily outsmarts his opponents with little to no effort. However, he is a formidable oppont physically as well, regardless of his highly advanced age.