Dr. Zachary Knell, also known as Doctor Clone and the Leviathan, is the head of metagene research at TriVext Corporation in Thunder City.
Knell and his team of scientists were responsible for discovering the metagene at TriVext in March, 1996. As the liaison to the U.S. government, Knell reported to U.S. Army Intelligence General Gerald Forrest. He also had a relationship with the MCCA, which delivered metahumans to TriVext for research purposes. Until 2001, Knell's assistant in metagene research was Dr. Charles Walker. He was nicknamed "Doctor Clone" by the scientists who worked under him because of the advances in cloning technology that he had almost singlehandedly accomplished, despite cloning being officially illegal.