Brainiac

Brainiac is a fictional supervillain in the DC Comics universe, primarily known as one of Superman's most formidable enemies. He is depicted as an advanced alien artificial intelligence or cyborg with a vast intellect, capable of processing information at incredible speeds. Brainiac is known for collecting knowledge and entire cities from different planets, often destroying the worlds to do so. His genius-level intellect, technological prowess, and ruthless nature make him a significant threat, challenging heroes like Superman to protect Earth and the universe from his plans of domination and destruction.