Spider-Man: The Animated Series

The Sting of the Scorpion (1x6)

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J. Jonah Jameson hires Dr. Farley Stillwell who is a raining genius in genetic engineering, to make a new super hero that can match and defeat Spider-Man. With a willing participant, Mac Gargain, they engineer the DNA of a scorpion and him together to form a new hero, The Scorpion. However, when Mac thinks they have turned him into a freak, hero turns to monster and he goes on a rampage. Spider-Man is then forced to step in to stop creation from killing creator.