Mad Scientists

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  Achilles Milo (DCAU)
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  Achilles Milo (Earth-508)
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  Achilles Milo (New Earth)
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  Achilles Milo (The Brave and the Bold)
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  Alexander Luthor (New Earth)
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  Alexander Luthor (Scooby-Doo Team-Up)
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  Alexander Salkind (Earth-One)
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  Alphonse Luzano (New Earth)
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  Amos Fortune (Earth-508)
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  Anthony Ives (Earth-508)
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  Anthony Ives (New Earth)
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  Anton Arcane (New Earth)
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  Armand Lydecker (Earth-508)
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  Arnold Hugo (Earth-508)
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  Arthur Light (Earth-508)
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  Axel Storm (Earth-508)

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  Baron von Rakenstein (Earth-One)
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  Bemis (Earth-S)
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  Bo Boppenheimer (A Fistful of Bastiches)
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  Brain (Earth-508)
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  Brain (New Earth)
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  Brain (Prime Earth)
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  Bug Baron (New Earth)

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  Chang Tzu (New Earth)
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  Clifford DeVoe (Earth-508)
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  Crystal Frost (Earth-508)

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  Dabney Donovan (New Earth)
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  Doc Morhar (Earth-508)
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  Doc Morhar (Earth-One)
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  Doctor Carcosa (New Earth)
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  Doctor Cyber (Earth-508)
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  Doctor Cyclops (Earth-508)
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  Doctor Cyclops (New Earth)
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  Doctor Drew (New Earth)
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  Doctor Mephistopheles (New Earth)

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  Edrid Orson (DC Animated Movie Universe)
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  Edrid Orson (Prime Earth)
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  Eobard Thawne (Earth-508)

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  Frederick von Frankenstein (New Earth)

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  General Electric (Prime Earth)
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  Georgia Sivana (Earth-508)
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  Gorilla Grodd (Earth-508)

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  Harold Kripstly (Lois & Clark)
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  Hector Hammond (Earth-508)
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  Heinrich Von Fuchs (Doom Patrol TV Series)
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  Hugh Marder (Prime Earth)
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  Hugo Strange (Earth-508)
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  Hunter Mann (Earth-Four)

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  Ira Quimby (Earth-508)
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  Ira Quimby (New Earth)

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  Jason Woodrue (Burtonverse)
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  Jason Woodrue (Earth-508)
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  Jonathan Crane (Earth-508)

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  Karl Helfern (Prime Earth)
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  Karl Hellfern (New Earth)
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  Kenneth Anderson (Earth-One)
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  Komrade Krabb (Earth-508)
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  Komrade Krabb (New Earth)

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  Lawrence Garner (Smallville)
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  Lena Luthor (DC Super Hero Girls)
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  Lesla-Lar (Earth-One)
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  Lex Luthor (Earth-21)
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  Lex Luthor (Earth-508)
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  Lex Luthor (Krypto the Superdog)
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  Louie the Lilac (Earth-508)

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  Mad Scientist (1941 Superman Cartoons)
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  Mantis Morlo (Pre-Zero Hour)
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  Mister Gadget (Lois & Clark)
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  Mister Mind (Earth-508)
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  Monsieur Mallah (Earth-508)
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  Morlo (New Earth)

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  Norman Techno (New Earth)

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  Pamela Isley (Earth-508)
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  Percival Sutter (Earth-508)
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  Percival Sutter (New Earth)
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  Princess Maru (Earth-508)
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  Professor Bravo (Earth-508)

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  Raven (Super Friends)
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  Rigoro Mortis (New Earth)
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  Rocco Togg (Earth-508)
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  Rocco Togg (New Earth)
• Roskoffin (Earth-Two)

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  Sandor Skuba (Earth-AD)
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  Serge Kroolman (New Earth)
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  Simon Ecks (Earth-508)
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  Spacemaster (Earth-S)
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  Sylvester Sebastopol (Earth-508)

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  Thaddeus Sivana (DC Extended Universe)
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  Thaddeus Sivana (Earth 5)
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  Thaddeus Sivana (Earth-S)
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  Thaddeus Sivana (Legends of the Superheroes)
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  Thaddeus Sivana, Jr. (Earth-508)
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  Thaddeus Sivana, Sr. (Earth-508)
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  Thaddeus Sivana, Sr. (New Earth)
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  Thomas Oscar Morrow (Earth-508)
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  Thomas Oscar Morrow (New Earth)
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  Turtle (Prime Earth)

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  Ultra-Humanite (Earth-508)

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  Veronica Cale (New Earth)
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  Victor Fries (Earth-508)
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  Vril Dox (Scooby-Doo Team-Up)
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  Vril Dox I (New Earth)

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  Warren Lawford (Earth-508)
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  William Magnus (New Earth)
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  Wizard (Earth-S)

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  Zor-El (Prime Earth)