Brainiac

Brainiac (voiced by Corey Burton, Jason Marsden, Mike Farrell, and Clancy Brown) was the planetary-wide supercomputer of Krypton until it left shortly before the planet's destruction. Afterwards, Brainiac traveled the galaxy in pursuit of knowledge and destroyed the sources of the knowledge to increase its value and sought to apply this to the entire universe to complete what it perceived as its function and purpose, making it a nemesis of Superman.