The Origin of Dr. Viper SWAT Kats: The Radical Squadron : Season 2 Episode 10

Dr. N. Zyme and Dr. Elrod Purvis engineer Viper Mutagen 368, a regenerative growth formula. Purvis steals the mutagen and its research for himself, only to be discovered by Zyme. Purvis trips down the stairs and becomes covered in the growth formula. He then collapses, supposedly dead and is taken to the morgue. Purvis is mutated by the formula and becomes Dr. Viper. He then proceeds to apply the mutagen to mosquitos and honey bees to attack those responsible for his mutation.