Metal Men villains

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  Agantha (New Earth)
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  Aluminum (New Earth)

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

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

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  Darzz the Dictator (Earth-One)
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  Death-Metal Men
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  Doctor Yes (Earth-One)

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  Fferka (Earth-One)

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

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  Helium (New Earth)
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  Helium (The Brave and the Bold)
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  Hydrogen (The Brave and the Bold)

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  Irving Bravo (Earth-One)

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  Leonard Ruttman (New Earth)

• Manta, the Flaming Doom (Earth-One)
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  Missile Men (Earth-One)

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  Nitrogen (The Brave and the Bold)
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  Norman Techno (New Earth)

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  Oxygen (New Earth)
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  Oxygen (The Brave and the Bold)

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

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  Robots of Terror

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

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  Uranium (New Earth)

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  Vox (Earth-One)

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  William Magnus (robot) (New Earth)

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  Z-1 (Prime Earth)
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  Zirconium (New Earth)