Primary Villains

• Vilgax
• Kevin 11
• Zs'Skayr
• Driscoll

A

• Ah Puch
• Alien Emperor
• Argit

B

• Bank Robbers (Washington B.C.)
• Bermuda Triangle Aliens

C

• Charmcaster
• The Circus Freak Trio
• Clancy
• Connor
• Criminals (A Change of Face)
• Criminals (Ben 10 vs. The Negative 10 (1))
• Criminal (Dogged Pursuit)
• Criminals (Goodbye And Good Riddance)
• Criminals (Permanent Retirement)

D

• DNAliens
• Dr. Aloysius Animo
• Dr. Animo's Creations
• Dr. Doomacus

E

• Edna

• Enoch
• Eon

F

• Forever Knights
• Forever Knights (alien force)
• Forever Knight King
• Forever Knight Prince
• Forever Knight's Robotic Dragon
• Forever Knight Ninja
• Frostbyte
• Fungal Brain/Mycelium

G

• The Great One

H

• Hex
• Highbreed

I

J

• Joey/Rojo
• Jonah Melville

K

• Kane North
• Kenko the Shapeshifter
• Kraab

L

• Limax

M

• Megawhatt
• Mike Morningstar
• Mot Snikrep
• Mr. and Mrs. Mann
• Mr. Beck
• Mr. Beck's Bald Henchman

N

• Negative 10
• Null Guardian

O

P

• Phil
• Pinky and Missy

Q

R

• Road Crew
• Robotic Tyrannosaurus Rex

S

• S.A.M.
• Shem
• Shem's Partner
• Sixsix
• Slix Vigma
• Sludgepuppies
• Sploot
• Sublimino
• Squires
• Super Alien Buddy Adventures Villains

T

• Taedenite Miners
• The Red Dragon
• Trans-Dimensional Monster

U

V

• Vilgax's Minions, Army, and Drones

• Vulkanus

W

X

• Xenocytes

Y

Z

• Zombozo
• Zombie Boy
• Zombies

• Zombie Girls
• Zs'Skayr's Minions