" Former private investigator Mac Gargan was hired by J. Jonah Jameson to find out how Peter Parker is able to get incredible pictures of Spider-Man. Gargan's efforts to locate Peter in order to find out the truth triggered Parkers's spider sense, making him easily avoidable.
Frustrated, Jameson decided to pay $10,000 to Gargan as the subject of an experiment. An experiment created by Dr. Farley Stillwell, a researcher in animal mutation which endowed the subject with the characteristic of another animal. Unfortunately the process resulted in the loss of Gargan's sanity, and the creation of the super-powered criminal menace known as the Scorpion."