Chris Bradford was one of the Shredder's top henchmen. As a human, he was a very skilled and quite well known martial arts celebrity, with his own line of dojos. By night, however, he operated as a ninja under the Shredder's employ. After coming face-to-face with the Shredder's enemies (the Turtles) a few times, he came into contact with the substance known as mutagen, transforming him into a giant anthropomorphic dog, which caused Michelangelo to dub him "Dogpound." In Mikey Gets Shellacne, Bradford came into contact with mutagen a second time, at which point he mutated into a more wolf-like form and became known as "Rahzar."