Tommyknockers

In Stephen King's novel The Tommyknockers, a massive spaceship is discovered in the earth and uncovered by Roberta "Bobbi" Anderson. The eponymous Tommyknockers are a monstrous alien race that possess technological prowess, but are hindered by their species-wide bout of psychosis. They have a corrupting influence on the nearby town of Haven, although their effects and appearances vary in both the novel and its 1993 miniseries adaptation.

Original Novel
Within the original book, the Tommyknockers have since perished as a result of the crash, caused by squabbles and fights among the crew. However, as the spaceship is unearthed, their influence corrupts the nearby town of Haven. This is caused by a radioactive gas emitted from the space craft that begins with basic symptoms such as bleeding and losing teeth. However, many of the townspeople are gradually transformed into the likeness of the Tommyknockers themselves, some gaining transparent skin and tentacles in place of their genitals. This poisonous influence grants the residents with their technological prowess, often making fantastical adjustments to household items and appliances that are powered by batteries (such as Anderson's water heater powered by a small nuclear reactor). However, the Tommyknockers' psychosis and violent tempers also carry onto the populace, prompting some residents to take violent measures against outsiders to ensure security and even against each other (such as one resident who uses a teleportation/disintegration machine to eliminate a member of his poker circle for cheating him).

Anderson's friend and ex-lover James "Gard" Gardener arrives in Haven after picking up on a hunch about Anderson being endangered by an unknown force. She uses him to help unearth the spaceship until they reach the hatch, the effects of the Tommyknockers getting stronger and harsher as more of the ship is exposed. He discovers how the transformed residents (referred to as those who are "becoming") have telepathic abilities and is initially protected from the aliens' effects by a metal plate in his head gained from a skiing collision. He finds more of their technology, most notably the shower stall-crafted stations used to house victims to be used as living batteries. Prompted to kill Bobbi after she's transformed into a Tommyknocker, Gard battles and kills a number of the transformed residents before he boards the ship and activates it, sending it into the sky as he succumbs to his wounds. While it comes at a heavy cost of killing virtually every resident due to the deprivation of the gas and the massive fire that follows its takeoff, Gard's efforts ultimately stop the Tommyknockers from further corrupting other humans.

1993 Miniseries
The Tommyknockers survived the crash in the miniseries adaptation, unlike in the original novel, and serve as more direct antagonists. They utilize a psychic emanation to slowly but surely drain the life energy out of the populace and even capture some of them to trap in pods for such purposes (akin to how victims were used as living batteries in the novel). They are directly confronted when the ship is entered, returning to life to attack Gard. However, they are ultimately defeated and destroyed as Gard takes control of their ship, freeing the townspeople from their control.