Fat-bots

Fat-bots are alien machines that have invaded Earth. They look like humanoid robots with multiple hoses coming out of them. They are able to use these hoses as arms and also force-feed their victims with special milk that makes the victim fatter when digested. Their only goal is to find and make people immobile. They can adjust which body part of their victim gets fatter. Fat-bots are known to release mechanical worms called fat-worms that are the size of an earthworm into places they have yet to invade. These worms enter a person's mouth while they are sleeping so they can begin hijacking parts of their victim's mind. They increase hunger, acceptance of fatness, and an attraction to fattening people up. The hijacking process may only take hours to take effect, but it takes weeks for the effects to become truly problematic. The only type of fat-bots who can get past the frontlines and into civilian territory are the infiltrator types. They have slender, humanoid shapes that focus on espionage and social hijacking. They will always avoid direct confrontation. If they go to talk to a target, they will try to hide the fact they are not human. If their cover is blown, they will run away. They have a limited storage of special milk due to having to be limited in size so as to keep up appearances. They can at most, fill a person's stomach up half way before needing to needing to make and store more special milk. However, since they brew their own special milk, they can add on unique traits to it other than weight gain and addiction, such as where the weight is displaced to or how it affects one's metabolism and bodily functions.

Fat-bots are invading earth, the military is struggling to fight them back. The battle for earth and it's battle lines has stabilized around the edges of Europe, where the initial invasion force of fat-bots landed. While earth's now united military force is capable of stopping mostly all of the fat-bots, a few infiltration forces still manage to slip through the front lines, and into civilian territory.