Brainiac (character)

Brainiac is a fictional supervillain appearing in American comic books published by DC Comics. Alongside, Lex Luthor, he is seen as a top enemy of Superman and the Justice League.
Brainiac is seen as an extraterrestrial cyborg or android. He is responsible for shrinking and stealing Kandor, the capital city of Superman's home planet Krypton. 
His name is a portmanteau of the words "brain" and "maniac". In 2009, Brainiac was ranked as IGN's 17th Greatest Comic Book Villain of All Time.