Neo Aliens are Lyoko monsters created by the Space Pirate Corporal Cylun as his forces to destroy humanity and make Earth his own planet. Some are variations of XANA's monsters.
- Dark Kankrelats - like the Kankrelats they are basic foot soldiers of the monsters that move in groups, and they have the same apperances as the Kankrelats, except that they have a black metal shell and purple legs with one red eye.
- Goboloids - Goboloids are Goblin monsters that travel in groups like the Kankrelats or they can travel alone for stealth attacks.
- Boarkluds - Boarkluds are Gigantic Humanoid Boar-men that are really skinny and are 22 feet tall. They use clubs and they travel with Dark Kankerlats and Gobloids.
- Salamander-Wraiths - Metal Salamander monsters that dress up in torn black cloaks that travel alone and hunt with guns. Salamander Wraiths can kill people imediately in one try.
- Black Hawks - Black Hawks are robotic black hawk birds that can shoot lazers out of their mouths and red eyes. They can cut through trees like knives slicing butter.
- Dragons - There are only 12 of these monsters in twelve elements, Air, Water, Earth, Fire, Frost, Moon, Shadow, Sun, Sand, Stone, Poison and Spirit.
- Golemoid - A huge Iron Golem in a Silver Knight Uniform or Samurai Uniform that can destroy anything in it's path. It is half as small as the Kolossus thankfuly.
- Colossaloid - A Giant Robot Warrior in a Golden Samurai Uniform that can slash anything in it's path. Colossaloid can even use lazer eyes to destroy anything in it's path.