Brainiac

Brainiac was a computer on the planet Krypton who knew about the end of Krypton but didn't say anything so he could save himself so that he could be the only Kryptonian left.Brainiac was designed on Krypton and is a Krypton computer system. He decided to let the people die so that he could escape. He felt as if he was the one who should be saved because he holds Krypton's information. Brainiac was suspected of knowing about the destruction by Jor-El, Superman's father. He knew about the end of the Planet but Brainiaccovered it up to make it seem as if the earthquakes on Krypton was nothing. Brainiac was discovered by Jor-El downloading himself and was chased by the police before the planet ended. Before the planet exploded, Brainiac finished downloading himself. Clark's archenemy is Brainiac because of this reason. Brainiac came to Earth and attacked Superman, who he knew was Jor-El's son from Krypton. Brainiac made copies of itself.

Origin
Vril Dox, better known as Brainiac, was an alien from the planet Colu. Upon his arrival to Earth Brainiac began shrinking various cities including Metropolis. It was up to Superman to save the day but when Superman confronted Brainiac he discovered that Brainiac had a "ultra-force shield" protecting him which made him impervious to all of Superman's attacks. Superman was able to defeat Brainiac but only thanks to the Kryptonians of Kandor sacrificing themselves to help Superman save the day.

Power and Abilities
Brainiac is a highly intelligent character. He is a 12th level intellect. Some incarnations of Brainiac have had the following powers and abilities;
 * Technopathy.
 * The ability to transfer his consciousness into computers and in some instances organic lifeforms.
 * Telepathic and telekinetic abilities.
 * Strength capable of rivaling Superman.

Equipment
Amongst the equipment used by Brainiac include a force field belt and a shrinking ray which Brainiac in the past used to shrink the city of Kandor.

Weaknesses
Brainiac has been shown to be quite vulnerable to bacteria and disease, particularly when outside of his skull ship.