Brainiac is a fictional character that appears in comic book published by DC Comics. The character first appeared in Action Comics #242 (July 1958), and was created by Otto Binder and Al Plastino.
An extraterrestrial android, Brainiac is a principal foe of Superman, responsible for shrinking Kandor, the capital city of Superman's home planet Krypton which has since been restored. Due to complex storylines involving time travel, cloning, and revisions of DC's continuity, several variations of Brainiac have appeared. Most incarnations of Brainiac depict him as a bald (save for a set of diode protruding from his skull) and green-skinned humanoid.
The character is the origin of the informal eponymous word which means "genius". The name itself is a portmanteau of the words brain and maniac, with influence from ENIAC, the name of an early computer.
First appearing in Action Comics #242 (July 1958), Brainiac was a bald, green-skinned humanoid who arrived on Earth and shrank various cities, including Metropolis, storing them in bottles with the intent of using them to restore Bryak, the planet he ruled. He protected himself from Superman using an ultra-force barrier which not even Superman could break through. While fighting Brainiac, Superman discovered that the villain had previously shrunk the Kryptonian city of Kandor. He was able to restore the Earth cities to full size, but the Kandorians sacrificed their restoration to help him. Superman stored the city in his Fortress of Solitude, vowing to return the natives to full size.
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Official Site: DC Comics
Links: Wikipedia Un. Guide to the DC Universe Superman Homepage