An alien infestation is a terrifying and often grotesque phenomenon where foreign, extraterrestrial organisms invade and take control of living beings, machines, or environments. These infestations can manifest in various forms, such as parasitic tentacles, crab-like claws, insectoid limbs, or glowing tubes that rapidly spread, corrupting and reshaping their hosts. Often portrayed in science fiction and horror, alien infestations represent the loss of control and identity as the host's body or systems are overtaken, transforming them into grotesque hybrids. Whether it’s through subtle takeovers or violent, body-horror-style mutations, alien infestations evoke fear by highlighting the fragility of the human (or technological) form when faced with an incomprehensible alien threat.