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Aliens are the main antagonists of the LEGO Alien Conquest toyline, and the overarching antagonists of several other toylines, namely Atlantis, Pharaoh's Quest and Dino.
They are extraterrestrial humanoids who attempt to conquer Earth and harvest humankind's brainpower as an energy source.
History[]
Past[]
The residents of Planet X2½ have longed schemed to conquer other worlds. One of them rules over an interstellar empire and feuds with the Intergalactic Girl, while the other commands a fleet that attempted to conquer Earth for hundreds of years. It was these aliens who armed Atlantis Guardians so they could seize the city, and they assisted Amset-Ra's plots, including the construction of his pyramid. After they both were defeated by modern-day humans, Hypaxxus-8 commenced a full-scale invasion of the planet.
Alien Conquest[]
The aliens attacked several major cities in the United States and around the world, abducting many humans and other Earth animals and transporting them to their mothership, where they had their brainpower sucked out of their heads. At one point, they managed to capture most of Alien Defense Unit's forces, but the humans still managed to turn the tide. This prompted Hypaxxus-8 to seek assistance from Amset-Ra and the Golden King (the latter being mind-controlled by an Alien Clinger) to build a mech too tough for ADU to handle. Nevertheless, the ADU Sergeant and Scientist found the mech's weak spot, and their forces destroyed it, which finally forced Hypaxxus-8 to retreat. He still had one trick up his sleeve, however, and unleashed dinosaurs for humans to deal with, but hasn't returned since.
Members[]
Hypaxxus-8[]
- Main article: Commander Hypaxxus-8

Hypaxxus-8 is the commander of an alien fleet. He schemed to suck out all of humanity's brainpower to use as fuel for his fleet and rule over them as the Earth's Supreme Overlord. He is also partially responsible for Amset-Ra's actions by assisting him hundreds of years ago. Hypaxxus-8 is highly arrogant, always insisting that he is the greatest leader in the galaxy and he and his troops are undefeatable, and referring to humans as "puny Earthlings". Despite this, he has an informal way of speaking, not unlike a common denizen of the planet he seeks to conquer.
Alien Villainess[]
- Main article: Alien Villainess

The Alien Villainess is the empress of a vast interstellar empire. It's mentioned that she sends commanders of her fleets out to conquer worlds for her, planning to eventually rule over the entire universe, implying that Hypaxxus-8 is but one of her servants. She is the arch-enemy of the Intergalactic Girl, who always foils her plans.
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