• Dr. Viper (voiced by Frank Welker) - Dr. Elrod Purvis once worked at Megakat Biochemical Labs alongside his partner Dr. N. Zyme. In a fit of greed, he tried to steal an experimental regenerative formula they were developing, but he became covered in the formula when he fell down the stairs and died from the shock. However, the chemicals revived him from death, mutating Purvis into a part kat, part iguana, part snake creature. With expertise in the fields of biology, genetics, and robotics, Dr. Viper now seeks to turn Megakat City into "Mutation City" and transform the residents into mutants like himself.

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