Ringmaster is a supervillain who uses illusions and hypnosis that comes from a device in his hat. He first appeared in the episode Comes a Swordsman. He, Swordsman, and the Circus of Crime plotted to steal the Mythrax Bacteria. Hawkeye infiltrates his Circus of Crime to find out their plot with the Mythrax. He used his illusions to throw off the Avengers until Falcon's bird Redwing sees through them. Ringmaster is defeated when the Mythrax Bacteria canisters were empty.