Amazing Spider-Man #20 - Fr 1.0

First Appearance of The Scorpion.
Ad page missing, story intact.
J. Jonah Jameson pays Dr. Stillwell to turn Mac Gargan into the Scorpion to try to capture Spider-Man. Stillwell's formula makes Gargan become more evil than he originally was and the Scorpion goes on a rampage and is finally stopped by Spider-Man.