History Main / InbredAndEvil

** Also as in the novels, the Targaryen family has a proud history of marrying cousin to cousin, uncle to niece, and brother to sister, producing the likes of [[Series/HouseOfTheDragon Daemon]], Aerys the Mad and his equally unhinged son Viserys the Beggar King and, ultimately, [[spoiler: [[FallenHero Daenerys]]]]. Perhaps notably, the two least inbred Targaryens in the show (Aemon and [[spoiler:Jon Snow]]) are also the most sane.

** As in the novels, Jaime and Cersei Lannister are in an incestuous relationship, and as in the novels their oldest son Joffrey is TheCaligula, this time with a side of sexual sadism atop his random acts of cruelty, murder, and domestic violence. Joffrey's siblings, Tommen and Myrella, however, are portrayed as good kids (again, as in the novels).

* Mordred is the FinalBoss of Myth/ArthurianLegend, and in the most famous telling, he's the offspring of Arthur and his half-sister, Morgause. The exact circumstances of this vary, as does its effect on Mordred--older legends often have him evil from the outset, while many modern takes depict him as good until [[GoMadFromTheRevelation learning the truth about his parentage]].

* While this was absent from the original ''[[Film/TheTexasChainSawMassacre1974 Texas Chainsaw Massacre]]'' and [[Film/TheTexasChainsawMassacre2 its sequel]], later installments in [[Film/TheTexasChainsawMassacre the franchise]] declared that Leatherface's oldest brother was also his father and that most of cannibalistic Sawyer clan were products of VillainousIncest.

This trope is found on both far ends of the socioeconomic spectrum. It's very rare among the middle-class, and can commonly be seen overlapping with AristocratsAreEvil and RoyalInbreeding, or with HillbillyHorrors and rural {{Bandit Clan}}s and {{Cannibal Clan}}s.

[[noreallife]]

* ''Series/TheBorgias'': In episode 2.09 "World of Wonders", Juan undergoes SanitySlippage while he's dying from syphilis and dulling the pain with opium. He muses about the possibility of his siblings Cesare and Lucrezia being lovers and starts to suspect that Lucrezia's child is really Cesare's and might well be TheAntichrist. This frames his later endangerment of the child in front of his mother, by dangling it over a balcony.

This trope is found on both the far ends of the socioeconomic spectrum, overlapping with AristocratsAreEvil and RoyalInbreeding, as well as with HillbillyHorrors and rural {{Bandit Clan}}s and {{Cannibal Clan}}s. Very rare among the middle-class.

This trope can be found on both ends of the socioeconomic spectrum, overlapping with AristocratsAreEvil and RoyalInbreeding as often as it does with HillbillyHorrors and rural {{Bandit Clan}}s and {{Cannibal Clan}}s. Very rare among the middle-class.

* ''Series/TheBorgias'': As Juan undergoes SanitySlippage while he's dying from an STD and dulling the pain with opium, he muses about the possibility of his siblings Cesare and Lucrezia being lovers and starts to suspect that Lucrezia's child is really Cesare's and might well be TheAntichrist. This puts his later endangerment of the child in front of his mother (by dangling it over a balcony) in a different light.
-->'''Juan:''' The issue of such a union would produce a demon to devour the worlds... and me.
* ''Series/CriminalMinds'': The Killer Woodsman from Season 9's "[[Recap/CriminalMindsS9E20BloodRelations Blood Relations]]" is the result of an incestuous relationship between siblings Malachi and Magdalene Lee, who [[ParentalAbandonment abandon him]] due to his deformities. Years later he begins stalking his parents and their new families, killing off his half-siblings in a rage at having been considered worthless.

* ''Series/LukeCage2016'': Tilda starts the second season off a reasonably good person, but after getting dragged into her family's crime business and put through tragedy after tragedy, the last straw that pushes her down a dark road is learning she's the product of incest between her mother and her [[CreepyUncle great-granduncle]]. While the series was cancelled before any plans with her could come to fruition, her [[SelfMadeOrphan actions]], [[ThenLetMeBeEvil demeanor]], and [[EvilMakeover appearance]] in the final two episodes make it clear she was gearing up to become a major villain going forward like her comic book counterpart, Deadly Nightshade.

** In the episode [[Recap/SupernaturalS01E15TheBenders "The Benders"]], a clan of hill folk are kidnapping people and [[HuntingTheMostDangerousGame hunting them for sport]]. It is heavily implied that the younger members are products of incest and likely also engaging in incest with the only female member of the clan.
** In the episode [[Recap/SupernaturalS04E11FamilyRemains "Family Remains"]], a suspected series of ghost murders turns out to have been committed by feral twins born out of the [[VillainousIncest incestuous rape]] of their mother/sister by their father/grandfather, which led to the mother/sister killing herself out of shame and the twins killing the father/grandfather out of rage. They then hid in the walls of the home to avoid detection but emerged to kill anyone who tried to inhabit the house.
* ''Series/TheTwilightZone1985'': In "[[Recap/TheTwilightZone1985S1E11 The Beacon]]", the inhabitants of the small town of Mellweather are all descended from a prominent citizen named Seth Janes who lived in the 18th Century. They believe that his spirit guides the Beacon, a lighthouse that seemingly chooses a HumanSacrifice every year, and that they must keep their bloodlines strong in order to serve him. After Dr. Dennis Barrows saves the intended victim, a little girl named Katie, he is killed by the townspeople in order to placate Seth.
* ''Series/TheXFiles'' featured an episode entitled [[Recap/TheXFilesS04E02Home "Home"]], [[BannedEpisode to great controversy]], about a murderous, inbred clan known as the Peacock family. The [[EvilMatriarch matriarch]], Mrs. Peacock, is involved in [[ParentalIncest incestuous relationships with her sons]], one of them being the father of the other two.