Brainiac (DC Animated Universe)

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History
In the DC Animated Universe, Brainiac is the central computer system of Krypton. Brainiac becomes aware of Krypton's impending destruction, but finds its destruction of little importance in contrast to the importance of all of Krypton's data. Brainiac abandons Krypton when the planet is about to be destroyed.

Brainiac creates a new goal for himself, to collect all the data of a planet and then destroy the planet.

Brainiac continues this path for years until eventually arriving on Earth. Intrigued that Kal-El exists he seeks to bond his DNA with that of Kal-El's to continue his quest for Data. Kal-El destroys the Brainiac drone but continues to be a threat as he downloads his program onto the computers of Lex Corp.

Brainiac orders Lex Luthor to rebuild his body at one point, and then injures Luthor, but does not kill him. Superman defeats Brainiac again, however.

Eventually Brainiac seemingly attacks Appokolips, but Darkseid secretly makes a deal with Brainiac to lure in Superman. Darkseid hacks into Brainiac's system and forces Brainiac to self-destruct, destroying Brainiac for good, or so it seems.

It is later revealed that Brainiac had spared Lex Luthor only to ensure his survival inside of Luthor. Brainiac planned to implant his mind into that of an Amazo droid but was stopped by the Justice League. Brainiac flees from the Justice League, using Luthor's body. Luthor questions Brainiac's motivations enough to interest Brainiac. The two merge together with Mars Nanotechnology to become an ultimate being. Brainiac desiring Luthor's creativity and desires with the power and knowledge that Brainiac has, but otherwise has no idea what to do with.

Brainiac-Luthor decide to create a machine that will absorb data of planets in a single stroke, but Brainiac-Luthor are stopped by the Flash.

Brainiac is seemingly gone from existence, but still exists within the mind of Luthor. Luthor discovers that Gorilla Grodd has the last existing piece of Brainiac. Luthor desperately tries multiple manners of activiating the one scrap left of Brainiac but it does not work.

Eventually Luthor goes to the location of Brainiac where he was destroyed, and attempts to ressurect Brainiac using magic, but surprisingly ressurects Darkseid instead. The psychic link is shattered from Luthor, thus ending Brainiac forever.