Lizard

The Lizard is a fictional character, a comic book supervillain in the Marvel Comics universe, and an enemy of Spider-Man. In his normal human state however, he is Dr. Curt Connors, a friend and ally of Spider-Man. The Lizard first appeared in The Amazing Spider-Man #6 (November 1963), and was created by Stan Lee and Steve Ditko. Curtis Connors was born in Coral Gables, Florida. He was a gifted surgeon who enlisted in the army and was sent off to war. He performed emergency battlefield surgery on wounded GIs, but his right arm was injured in a blast and had to be amputated. After his return to civilian life as a research technologist, he became obsessed with uncovering the secrets of reptilian limb regeneration and studied reptilian biology extensively. From his home in the Florida Everglades, he finally developed an experimental serum taken from reptilian DNA. He successfully regrew the missing limb of a rabbit and then, despite the warnings of his wife Martha, chose to test it on... full article at wikipedia