The Masters of Evil is a fictional supervillain team appearing in American comic books published by Marvel Comics. Although the roster has changed over the years, the team remains the principal foes, and the evil counterpart, of the superhero team the Avengers. Listed here are the known members of the Masters of Evil. Membership listed alphabetically, after leader Baron Heinrich Zemo's incarnation Avengers #6-7, 9-10, 15-16 (July 1964 - May 1965) Baron Heinrich Zemo (leader) - He is an old enemy of Captain America from World War II. Black Knight (Nathan Garrett) - A descendant of Sir Percy of Scandia and an enemy of Giant-Man who uses an arsenal of medieval weapons that employ modern technology (including a lance that fired bolts of energy) and genetically engineers and creates a winged horse called Aragorn. Enchantress (Amora) - An Asgardian sorceress and an enemy of Thor. Executioner (Skurge) - A half-giant companion of Enchantress and an enemy of Thor. Melter - An enemy of Iron Man who uses melting devices. Radioactive Man - A nuclear physicist with radioactive abilities and an enemy of Thor. Wonder Man - The owner of Williams Innovations who gains his ion-based powers from an ion ray. He sacrificed himself to save the Avengers. Ultron's incarnation Avengers #54-55 (July - Aug. 1968); 83 (Dec. 1970) Ultron-5 (leader) - A robot that was created by Hank Pym. Black Knight (Dane Whitman) - The nephew of Nathan Garrett. He joined the team with the intention of betraying them. Klaw - A sound-based supervillain who is an enemy of the Black Panther and the Fantastic Four. Whirlwind - A mutant with wind-based abilities who is an enemy of Giant-Man and the Wasp. Melter Radioactive Man Egghead's incarnation Avengers #222 (Aug. 1982); 227 - 229 (Jan. - Mar. 1983) Egghead (leader) - A mad scientist with an egg-shaped head who is an enemy of Hank Pym. Beetle (Abner Jenkins) - A supervillain in beetle-themed armor who is an enemy of Spider-Man. Moonstone - A supervillain whose powers derive from an alien gem who previously fought Captain America and the Hulk. Radioactive Man Scorpion (Mac Gargan) - A scorpion-themed supervillain who is an enemy of Spider-Man. Shocker (Herman Schultz) - A supervillain wielding vibration gauntlets who is an enemy of Spider-Man. Tiger Shark - A tiger shark-themed supervillain who is an enemy of Namor the Sub-Mariner. Whirlwind Baron Helmut Zemo's first incarnation