Heavy Duke is Leader of the Unknowables Street Gang who ruled the 8th Street neighborhood. In a sense of comedy when they steal a boombox, the owner earned their anger by asking who they were. The joke being well... maybe that's why no-one's heard of you. Upon hearing that Mikey was holding a rave in their neighborhood, Heavy Duke decided to crash it and steal the Animal Rights donatation. Adding onto the comedy, his group constantly got in Bonesteel's way of capturing the Turtles. Tricked by Bonesteel, Heavy Duke attempted to capture the Turtles for the cash the hunter promised would come for them. He, and Bonesteel ended up becoming human pinatas, humiliated in front of the crowd. Ninja Turtles: The Next Mutation