Brainiac is a being known for conquering civilizations and killing billions of people.
Having conquered a multitude of civilizations and killed billions of people, Braniac eventually became an enemy of the Kryptonian hero known as Superman. Eventually Brainiac found a way to time travel to the past during the time Superman's grandfather Seg-El was alive and made his way for Krypton, intending to destroy it and wipe his enemy from existence. He sent a forward scout, before infiltrating the planet, unbeknownst to its occupants.
- "House of El" (mentioned)
- "The Rankless Initiative"
- "Civil Wars" (in Voice of Rao's body)
- "Transformation" (in Voice of Rao's body)
- "Savage Night" (in Voice of Rao's body)
- "The Phantom Zone"
- In some versions, Brainiac is responsible for destroying Krypton and even made Kandor part of his collection.