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DC

Brainiac is a recurring supervillain in DC Comics, primarily known as one of Superman's greatest adversaries. First appearing in Action Comics #242 (July 1958), Brainiac is typically depicted as an extraterrestrial android or cyborg with a vast intellect and an insatiable thirst for knowledge.

His primary goal is to shrink and steal cities from various planets, adding them to his collection to study and preserve them while simultaneously eliminating their populations. He believes this preserves knowledge and life, though his methods are often ruthless and destructive. His advanced intellect makes him a formidable foe, capable of devising complex schemes and utilizing advanced technology.

Brainiac's appearance has varied over the years, but he is often portrayed with green skin and a bald head. He represents a constant threat to Earth and the wider DC Universe, driven by his insatiable desire to understand and control all information.