(Speeding Bullets)
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| Jade | Java | Javelin | Jax-Ur | Jericho | Jewelee |
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| Jimmy Olsen | Joe Chill | Johnny Thunder & Thunderbolt | Johnny Quick | The Joker | The Joker (Lex Luthor) (Speeding Bullets) |
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| Jolt | Jonah Hex | Jor-El | Juice | June Robbins |
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| The Kabuki Twins | Kanjar Ro | Kanto | Kalibak | Karate Kid | Karkull |
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| Katana | Katma Tui | The Key | KGBeast | Kid Flash | Kid Quantum |
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| Killer Croc | Killer Frost (Louise Lincoln) |
Killer Frost (Caitlin Snow) |
Killer Moth | Kilowog | King Faraday |
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| King Owl | King Tut | King Snake | Kite-Man | Klarion The Witchboy |
Knight (Cyril Sheldrake) |
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| Kobra | Krona | Krypto |
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| Lady Blackhawk | Lady Shiva | Lady Spellbinder | Lady Quark | Laira | Lara |
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| Lashina | Lavrox | Lead | Lex Luthor (precrisis) | Lex Luthor | Light Lass |
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| Lightning Lad | Lightray | Livewire | Lobo | Lois Lane | Longshadow |
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| Lor-Zod | Louie the Lilac | Luminus | Lynx |