Metal Men villains

• 
  Agantha (New Earth)
• 
  Aluminum (New Earth)

• 
  B.O.L.T.S.
• 
  Balloon Man II (Earth-One)
• 
  Barium (New Earth)

• 
  Calcium (New Earth)
• 
  Carbon Dioxide (New Earth)
• 
  Carbon Monoxide (New Earth)
• 
  Chemo (Metal Men Shorts)
• 
  Chemo (New Earth)
• 
  Chemo (Prime Earth)
• 
  Chemo (The Brave and the Bold)
• 
  Chloroform (New Earth)
• 
  Clique
• 
  Coven of Seven
• 
  Cruel Clowns

• 
  Darzz the Dictator (Earth-One)
• 
  Doctor Yes (Earth-One)

• 
  Fferka (Earth-One)

• 
  Gas Gang (New Earth)
• 
  Gas Gang (The Brave and the Bold)

• 
  Helium (New Earth)

• 
  Leonard Ruttman (New Earth)

• 
  Missile Men

• 
  Norman Techno (New Earth)

• 
  Oxygen (New Earth)

• 
  Plastic Perils
• 
  Platinum Man (New Earth)
• 
  Plutonium (New Earth)
• 
  Plutonium Man (New Earth)
• 
  Professor Snakelocks (Earth-One)

• 
  Robots of Terror

• 
  Sizzler (Earth-One)
• 
  Sodium (New Earth)
• 
  Solar-Brain (Earth-One)
• 
  Syntho-Rob One (Earth-One)

• 
  Uranium (New Earth)

• 
  Vox (Earth-One)

• 
  William Magnus (robot) (New Earth)

• 
  Zirconium (New Earth)