One of the most intelligent beings in the universe, the wicked Brainiac's genius has challenged Superman time and again.
Superman’s nemesis Lex Luthor may be the smartest criminal mind on Earth, but his intellect is no match for the alien artificial intelligence known as Brainiac. Nevertheless, Brainiac shares Luthor’s intense hatred of the Man of Steel, and has continued to use his Twelfth-Level intellect over the years to bring down the Last Son of Krypton.
Originally from the planet most frequently named Colu, Brainiac’s artificial mind and body have morphed several times over the decades, but his unquenchable thirst for absolute knowledge, regardless of the billions of innocent lives which might be destroyed in the process, has made him one of the deadliest villains the universe has ever seen. For Brainiac, the knowledge he acquires is only valuable if he and he alone possesses it, and no one else.
Thanks to his highly advanced, computerized brain, Brainiac is always ten steps ahead of his opponents, even ones as clever as Superman. Ultimately, his inability to see beyond pure logic has always been his downfall. But like a bad computer virus that can never be fully purged, Brainiac always manages to turn up again when one least expects him.
alien technology, genius-level intellect
ACTION COMICS #242 (1958)