Mad Scientists

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

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

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

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

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

• 
  Frederick von Frankenstein (New Earth)

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

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

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

• 
  Jason Woodrue (Burtonverse)
• 
  Jason Woodrue (Earth-508)
• 
  Jonathan Crane (Earth-508)
• 
  Josephus Doombie (Earth-Two)

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

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

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

• 
  Norman Techno (New Earth)

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

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

• 
  Sandor Skuba (Earth-AD)
• 
  Serge Kroolman (New Earth)
• 
  Shiro Ito (Stargirl TV Series)
• 
  Simon Ecks (Earth-508)
• 
  Spacemaster (Earth-S)
• 
  Sylvester Sebastopol (Earth-508)

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

• 
  Ultra-Humanite (Earth-508)

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

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

• 
  Zor-El (Prime Earth)