Dr. Viper



Dr. Viper is mad scientist who is part cat, part snake, voiced by Frank Welker. Once, he was Dr. Elrod Purvis, an unremarkable biochemist who worked at Megakat Biochemical Labs. He helped Dr. N. Zyme create Viper Mutagen 368, then tried to steal it from him to sell to the highest bidder. Dr. Zyme, however, caught him in the act, and a fight broke out, which ended with Purvis taking a fall down a flight of stairs and spilling the chemical on himself. He was believed dead, but instead the mutagen revived him and mutated him into a half cat-half snake hybrid. Purvis went to live in Megakat Swamp and named himself Dr. Viper, and since then has tried repeatedly to take over Megakat City to turn it into his own swampland paradise (alteratively referring to it as either "Megaswamp City" or "Mutation City").He first appears in the episode The Giant Bacteria, wherein he mutates his fellow evildoer Morbulus into a Giant Bacteria monster and uses him in an attempt to steal Katalyst 99 from Megakat Biochemical Labs. In Destructive Nature, he takes over the 300-story office building known as the Megakat Tower with his army of acid-spitting Plantimals, placing a gigantic spore pod on the roof so that it will explode and shower the city with spores, turning it into a swamp. Later, in the episode Katastrophe, Viper teams up with Dark Kat and The Metallikats in a bid to destroy the SWAT Kats, but their alliance falls apart because the villains cannot work together. In Mutation City, Viper floods Megakat City with a chemical called Katalyst X-63 in a second attempt to turn the city into a swamp. This time he very nearly succeeds, but the Swat Kats are able to retrieve the anti-mutagens from Megakat Biochemical and restore the city to normal, despite T-Bone being mutated and Viper using the Katalyst on himself to become a skyscraper-sized monster.