Dr. Viper

Dr. Viper was a villain who appeared in the cartoon series "SWAT Kats". Originally known as Dr. Elrod Purvis he worked at Megakat Biochemical Labs and 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. However the chemicals somehow revived him, mutating him into a snake-like creature that would quickly be known as Dr. Viper. With knowledge in the fields of biology, genetics and robotics, he sought to turn Megakat City into Mutation City, where he would reign as its absolute ruler. He was able to turn people like Morbulus into monsters and was became one of the most deadly opponents the SWAT Kats faced, he and his creatures murdered a number of innocent people throughout the course of the series.