Hector Hammond is Green Lantern's first enemy. Originally, he was a high school professor who was close friends with Hal Jordan and Carol Ferris. However, he was contacted by the government to perform an autopsy on Abin Sur's corpse, causing Hammond to come into contact with a shard of Parallax's DNA, which mutated Hammond, giving him telekinesis but also enlarging his head. Eventually going insane, Hammond would come into conflict with Green Lantern.