The Lizard
Lizard (Curt Connors) is a former scientist at Oscorp Industries. He was Richard Parker's partner and colleague, and was working on the Lizard Serum with him. After Parker's death, Connors befriends his son, Peter.
The Lizard is a perfect example of science gone awry. One could blame Connors for creating the Lizard, but no one should blame him for the actions the Lizard does. When his reptilain mind takes over, Connors loses complete control and there only remains the savage, powerful, cross-species monstrosity known as the Lizard.