One tells him to finish the atomic reactor USS-CO-BOLT and Birdman, but fails. The Mummer - A supervillain who is a master of disguise. Unlike most of Birdman's enemies, the Mummer was able to escape from him thanks to his disguises making him one of a few villains to get away. Kiroff - A supervillain who was responsible for causing worldwide earthquakes. Zardo - A supervillain who at one time captured Avenger. He received a complete redesign in Harvey Birdman, Attorney at Law. The Constrictor - Dressed like a snake and has two boa constrictors as his pets, this supervillain captures Avenger and tries to use him in order to capture Birdman. Birdman finds Avenger and burns Constrictor's headquarters down. Constrictor realizes Birdman is too powerful to be defeated and manages to escape, Birdman never caught the Constrictor making him one of a few villains to get away. Reducto (voiced by John Stephenson): A supervillain who wields a shrink ray. He uses this ray to demand money from Central City or he will shrink it. After being defeated by Birdman, he is shrunken down to microscopic size. Doctor Shark - A supervillain who fought Birdman underwater and had the face of a shark, but the body of a man. Birdman had to constantly regain his strength by battling Doctor Shark in small increments so that he did not lose his energy from being away from the sun. Doctor Shark was eventually defeated. Hannibal the Hunter - A big game hunter who is determined to hunt down Birdman. Mentor the Mind-Taker (voiced by Don Messick) - Mentor has the ability to send cerebral messages to a person or animal to do his bidding. He uses this ability to get Birdman to steal missiles from the United States government. He plans on using these missiles to start a war between two countries. He was renamed Mentok when he appeared in Harvey Birdman, Attorney at Law. The name change was also carried over to the Hanna-Barbera Beyond comics. Dr. Freezoid - Dr. Freezoid has a weapon that can turn an entire city block into ice. He has a retreat at the North Pole. Birdman causes him to self-destruct his base of operations with his own weapons trapping Dr. Freezoid inside. The Duplicator (voiced by Frank Gerstle) - An old man with large glasses, the Deadly Duplicator uses his glasses to create duplicates of