Dr. Viper is one of the principal villains in SWAT Kats: The Radical Squadron. He appeared in five episodes total and was voiced in all of them by Frank Welker. Dr. Elrod Purvis worked at Megakat Biochemical Labs. He tried to steal an experimental regenerative formula he and Dr. N. Zyme were developing. He became covered in the formula when he fell down the stairs and the shock ultimately killed him. The chemicals revived him from death, mutating Purvis into a half-kat, half-serpent creature. With expertise in the fields of biology, genetics and robotics, he sought to turn Megakat City into "Mutation City" and transform the residents into mutants like himself. He first appeared in "The Giant Bacteria." He was able to turn people like Morbulus into monsters. Dr. Viper was by far the deadliest enemy of the SWAT Kats, and he and his creatures murdered a number of innocent people (including his former colleague Dr. N. Zyme) in the series. The only weapon he has on hand is his tail, which he uses to smack his enemies away. He made a final appearance in "Mutation City", where he floods Megakat City with a slimy orange ooze with mutated monsters created from the experimental formula Katalyst X-63. He even douses himself with the formula and turns into a giant Godzilla-like monster and rampages through the city. In this state, he attempted to stop Razor from using the anti-mutagen but ultimately failed and was caught by the anti-mutagen's explosion which turned the creatures and the city to its normal state. Since then, he disappeared without a trace. He was similar to the Spider-Man villain The Lizard.
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