| Ben 10 Villains
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| Main Villains
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| Aggregor • Diagon • Incursean Empire (Attea, Dr. Psychobos, Frolic, Lieutenant Rana, Milleous, Sang-Froid, Major Glorff), • Forever Knights (Connor, Driscoll, Enoch, Joseph Chadwick, Patrick, Red Knight, Sir Cyrus, Sir Dagonet, Sir Morton, Sir Reginald, Squire, Urian) • The Faction (Khyber, Malware) • Vilgax • Zs'Skayr
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| Secondary Villains
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| Albedo • Aloysius Animo • DNAliens • Elena Validus • Eon • Flame Keepers' Circle (Conduit Edwards, Esoterica) • Hex • Lucubra • Michael Morningstar • Negative 10 • Psyphon • The Sotoraggian Mercenaries (Sixsix, Sevenseven, Eighteight) • Vulkanus • Will Harangue • Xenocyte • Zs'Skayrs's Servants (King Viktor, Mummy, Yenaldooshi)
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| Minor Villains
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| Adwaita • Aggregor's Soldiers • Animo's mutant animals (Heatbat, Mutant Ant, Mutant Chicken, Mutant Cockatiel, Mutant Frog, Mutant Giraffe, Mutant Hamster, Mutant Hornet, Mutant Lepidopterran, Mutant Mammoth, Mutant Mosquito, Mutant Seagull, Mutant Squid, Mutant Tyrannosaurus) • Billy Billions • Camille's Ex-Boyfriend • Captain Kork • Carl Nesmith • Circus Freak Trio (Acid Breath, Frightwig, Thumbskull) • Clancy • Coach Finn • Computron • Computron's Minions • Evil Way Big • Fistrick's Gang (Fistrick, Corvo, Hoodlum, Unnamed Thug) • Garbage Monster • Gorvan • Highbreed Tree Monster • Howell Wayneright • Jarrett • Jennifer Nocturne • Kraab • Kolar • Ma Vreedle • Mayor Coleman • Mechaneers • Mizaru • Morgg • Mr. Mann • Mrs. Mann • Mutant Seagull (Ultimate Alien) • Mycelium • Nanochips • Nyancy Chan • Palorfang • Pickaxe Aliens • Plant Alien • Plant Clones • Psyphon's Gang (Bubble Helmet, Fistina, Liam, Thunderpig, Tummyhead) • R.E.D. • Ragnarok • Red Robot • Road Crew (Baron Highway, Road Rage, Turbine) • Rojo's Gang (Rojo) • Sublimino • S.A.M. • Seebik • Slix Vigma • Squires • Ssserpent • Sunder • Sunny • Synthroid • Techadon Robots • The Decoy Queen • The Great One • Trumbipulor • Violet Offenders • Vilgax's Drones • Zombozo
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| Frenemies
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| Argit • Baz-El • Bellicus • Blarney T. Hokestar • Hope • Hope's Stone Creatures • Mazuma • Mr. Baumann • Null Guardians • Pakmar • Raff • Serena • Simian • Vreedle Brothers (Octagon Vreedle, Rhomboid Vreedle)
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| Former Villains
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| Bivalvan • Cash • Dragon • Decka • Devlin Levin • Eon's Servants • Ester • Helen Wheels • Highbreed (Reinrassic III, Highbreed Commander, Highbreed Councilors) • J.T. • Kenko • Kevin Levin • Khyber's Dog • Manny Armstrong • P'andor • Prisoner 775 • Ra'ad • Retaliator • Sentient Ultimate Big Chill • Sentient Ultimate Cannonbolt • Sentient Ultimate Echo Echo • Sentient Ultimate Humungousaur • Sentient Ultimate Spidermonkey • Sentient Ultimate Swampfire • Sir George • Technorg • The Great One's Worshipers (Leader Alien, Enforcer Alien, Interpreter Alien) • Thomas Jingles • Vance Vetteroy • Victor Validus • Winston • Yeti
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| Generator Rex Villains
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| Alpha • Biowulf • Black Knight • Skalamander • I-Bol
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| Future & Alternate Villains
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| Albedo (Vilgax Attacks Timeline) • Albedo (Cosmic Destruction Timeline) • Crooks (Dimension 23) • Dr. Animo (PoE Timeline • Dr. Animo (Ben 10,000 Timeline) • Enoch (Cosmic Destruction Timeline) • Enoch (PoE Timeline) • Evil Way Big (Albedo) • Exo-Skull • Gorvan (Alternate Timeline) • Kevin 11,000 • Kevin Levin (PoE Timeline) • Khyber (Omniverse Game Timeline) • Malware (Omniverse Game Timeline) • Mot Snikrep • Psyphon (Cosmic Destruction Timeline) • Psyphon (Omniverse Game Timeline) • Sploot • Terracotta Army • Terracotta Dragon • Terracotta General • Vilgax (Ben 10,000 Timeline) • Vilgax (Gwen 10 Timeline) • Vilgax (Vilgax Attacks Timeline) • Vilgax (PTE Timeline) • Vilgax (PoE Timeline)
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