Peacock Family

"You look fine, they'll be coming now.. we knew this day was gonna happen, when they try and change the way things are; all we can do about changing thing is be ready for it, be ready for them.. let them know this is our home and this is the way it's gonna stay!"

- Mrs. Peacock

The Peacock Family were villains from the X-Files universe - they were a group of hideously deformed inbred mutants that had become all but feral over the years and got into confrontation with the famous FBI duo when the two arrived to investigate the discovery of a heavily deformed infant that had been buried in a shallow grave.

History
The Peacock Family consisted largely of males and were greatly feared in their community, the local Sheriff knowing of their incestuous relationships yet turning a blind eye to them however when Agents Mulder and Scully investigate further they find out that the infant had in fact been buried alive and Scully feared the Peacock boys had a woman held hostage in their home due to the absence of other women to breed with.

However after they come into investigation the Peacock boys fly into a horrific rage and assault the local Sheriff's home at night - brutally murdering both him and his wife. Mulder and Scully ally with the local Deputy in an attempt to bring the Peacock Family to justice but as the Deputy tries to enter the home he is decapitated by a death-trap set up by the boys.

Thinking fast Agent Mulder and Scully distract the Peacock boys via releasing their pigs - in the distraction they come across the boy's amputee mother, who was the one responsible for all the misfortunes of the town as well as the mother of the murdered infant.

The boys once again fly into a rage and one of them is killed by their own death-traps in the end however the mother and Edmund manage to escape and are seen in the end-credits driving off to a new location, intent on settling down elsewhere and presumably starting the vicious cycle all over again.

Abilities
due to severe deformities and mutation across several generations the Peacocks can no longer feel physical pain, thus can withstand incredible amounts of punishment - they are also immensely strong and capable of flying into a rabid rage, they are described as having regressed to a near-animal state and when engaged in violence they can often exhibit behavior and mannerisms associated with pack animals or predators, such as circling "prey" and even smelling the air to try and pick up scents (as they did when hunting for the sheriff's wife, who was hiding under her bed at the time).

Despite this at least Edmund and Mrs. Peacock showed the ability to perform greater tasks, such as building death-traps and (in Edmund's case) driving a car - Edmund was also partial to listening to "Wonderful Wonderful" whenever he was driving, a symbolism of his pride in his family and their way of life.

Trivia

 * The Peacock Family are a clear homage to the Texas Chainsaw Massacre and Hills Have Eyes.
 * the episode remains one of the show's most controversial ever aired due to the theme of incest and the Peacock Family's monstrous barbarism.