||I don't think Sherlock Holmes could figure out half the bizarre crap happening in this town. I mean, this place literally is the Bermuda Triangle of homicides, disappearances, and strange occurrences.
The earliest known history of Beacon Hills dates back to World War II, when the town created a internment camp called Camp Oak Creek in order to imprison Japanese immigrants and Japanese-Americans in the aftermath of the attack on Pearl Harbor. This camp was located near Eichen House, which was then used as a field hospital for the internees and the soldiers who ran it, and those interned there included the Celestial Kitsune Noshiko Yukimura and then-Beta Werewolf Satomi Ito.
In 1943, after a riot broke out at the camp following the revelation that the camp's doctor and several members of the Army Military Police were stealing medication meant for those at the camp (which led to a pneumonia epidemic that killed several people due to the lack of necessary antibiotics to treat them), the riot escalated to a firefight on the part of the military that killed dozens of internees, as well as one of the soldiers, Corporal Rhys.
Upon learning that the riot and subsequent carnage would be covered up by the United States government, Noshiko prayed to her ancestors for kitsune-tsuki, or possession by a Fox spirit, specifically a Nogitsune who would help her heal and give her additional strength with which to get revenge on those responsible. However, the Nogitsune ultimately possessed Corporal Rhys' body instead and used it to slaughter the rest of the soldiers and internees alike at the camp. Horrified by what the Nogitsune she summoned had done and desperate to prevent it from causing any more chaos, Noshiko and Satomi ultimately worked together to incapacitate the Nogitsune and trap him in a prison within the roots of the Nemeton, which had yet to be cut down at this time. ("The Fox and the Wolf")
In the early 2000s, a summit between four Werewolf packs was held in Beacon Hills, which was led by Talia Hale and the Hale Pack and attended by Deucalion's original pack, Kali's original pack, and Ennis's original pack. After discussing the current threat of the Argent Family of Hunters, who had recently killed one of Ennis' Betas in retribution for the Beta accidentally killing two of their own, Ennis voiced his opinion that they should get revenge on the Argents. Though Deucalion argued for peace, Talia reminded Deucalion that it is Ennis' right to seek justice.
Despite this, Deucalion tried to convince Gerard Argent, the Argent family patriarch, to a truce by summoning him to the abandoned distillery, but instead of a parley like he was hoping, Gerard betrayed them all by killing his own men with a mace covered in Werewolf claws before killing the two Betas who accompanied Deucalion, using the weapon in a way that made the wounds resemble those sustained by a wolf, as he would later claim that the Betas staged an ambush against them so he could justify this violence. He then proceeded to blind Deucalion by stabbing flash-bang arrows into his eye sockets, a devastating blow to both Deucalion and his pack.
Upon learning that Deucalion's sight would likely never return due to the immense damage caused to his eyes, another of Deucalion's Betas, Marco, tried to kill him and take his Alpha status, leading Deucalion to realize that he had managed to retain his sight in werewolf form despite his injuries. Overcome by the rage caused by both Marco and Gerard's betrayal, Deucalion furiously and viciously killed Marco, leading him to learn a new fact about Alpha werewolves-- that when they kill their own Betas, they become more powerful due to the Beta's power being added to their own. Deucalion, who had become corrupted by the rage he felt after being blinded and the rush that he felt from killing Marco and taking his power, then went on to kill the rest of his remaining Betas in order to steal their power, which ultimately led him to be known by the moniker "the Demon Wolf." ("Visionary")
Concurrent to the summit, Peter Hale, then in his mid-20s, managed to convince his teenage nephew Derek to have Derek's girlfriend Paige Krasikeva turned into a Werewolf, arguing that it would prevent Paige from breaking up with him upon learning what they were, and that it was the perfect time due to the number of Alphas currently in Beacon Hills. Derek ultimately agreed to Peter's plan, and Peter arranged for Ennis, who was in need of a new Beta to replenish his ranks after losing a Beta to the Argents, to give Paige the Bite.
However, Paige immediately began to reject her transformation after being bitten, and Derek, not knowing what else to do, brought her to the root cellar of the Nemeton and summoned Peter in hope that he would know what was happening to her. Paige, who was in a great deal of pain, begged Derek to end her suffering by killing her, which he ultimately did, much to his devastation. However, Derek did not realize at the time that by killing Paige, a virgin, on the roots of the Nemeton, he was giving it a spark of power again that it hadn't had in years. ("Visionary")
Some time later, after Deucalion had killed his pack, he decided to start an Alpha Pack that would be comprised of others like himself-- Alphas who had augmented their powers by taking the lives and power of their Betas. He invited Ennis and Kali to join him, though he required that they kill their Betas and their Emissaries before they could do so. Ennis was the first to comply with Deucalion's wishes and join them, followed by Kali, who killed all of her Betas without a second thought. However, she was conflicted about killing her Emissary, Julia Bacarri, whom she loved dearly; though she did maul Jennifer so severely that she was near death, she was unable to give the killing blow, ultimately deciding to leave her for dead in the Beacon Hills Preserve rather than finishing her off. ("Visionary"), ("The Overlooked")
However, Julia had enough strength to crawl to the Nemeton and use the spark of power it had recently gained from Paige's unintended sacrifice to stay alive long enough for the police to find her. In the hospital, she used her Druid powers to cause hundreds of crows to commit mass suicide by flying into the windows while she was in surgery to give her the power necessary to ensure her survival. She became incredibly insecure by the devastation Kali's attack had wrought on her face and body, and while she physically recovered, she began to make plans to get her revenge against Kali and the Alpha Pack for what they had done to her. ("The Girl Who Knew Too Much"), ("The Overlooked")
In late 2004 or early 2005, the Hale House Fire occurred, killing between eight and eleven members, both human and Werewolf, of the Hale Family, including Talia Hale. The fire was set by Kate Argent, a Werewolf Hunter from the prominent Argent Family, and nearly a dozen co-conspirators, and though there were suspicions that it was an arson, the case was not investigated further after a corrupt insurance adjuster, Kate's co-conspirator Garrison Myers, fraudulently declared the fire to be caused by faulty wiring.
The only survivors of the fire were Peter Hale, who remained in a coma for the next six years, Laura and Derek, and Cora Hale. Derek and Laura, who were at school at the time of the fire, immediately fled to New York, not realizing at the time that there were any other survivors. ("Wolf Moon"), ("Pack Mentality"), ("Magic Bullet"), ("Wolf's Bane"), ("Code Breaker") Cora, meanwhile, who was eleven years old at the time, had escaped the house during the fire and went on the run (as she, too, believed that everyone, including Derek and Laura, had died in the fire), ultimately ending up with a Werewolf pack in South America. ("Unleashed"), ("Riddled")
In January 2011, the supernatural community of Beacon Hills, which had been relatively quiet with regards to supernatural events in the years following the Hale Fire, began to grow once again. This started with the recently-recovered Peter Hale, who had become an Alpha after killing his niece Laura Hale, and who gave the teenage Scott McCall the Bite while he was in the woods one night, making Scott Peter's first and only Beta since his ascension.
The death of Laura in town had drawn a branch of the Argent Family back to Beacon Hills (which included Chris Argent, his wife Victoria, and their daughter Allison), and the family decided to settle down there after spending the last few years constantly moving around so Chris and Victoria could hunt Werewolves. ("Wolf Moon"), ("Pack Mentality") Laura's death also brought her younger brother Derek Hale back to town, as he was eager to figure out who had truly really killed her, since he was initially under the impression that it had been the Argents due to the fact that her body had been cut in half as per Hunter tradition to ensure the victim would not survive. Additionally, the influx of supernatural creatures and Hunters to town ultimately brought Alan Deaton, a Druid and former Emissary to the Hale Pack, out of "retirement," though he had maintained his day job as a veterinarian at his animal clinic during his sabbatical from the supernatural world, where eventually hired Scott McCall to be his veterinary technician.
Over the next year, the supernatural community continued to grow, due in part to Peter's actions; though he was ultimately killed by Derek, who stole his Alpha powers, he still had a chance to attack Lydia Martin before his death. Although Lydia received the Bite from Peter, she was not turned into a Werewolf as was expected, which was eventually revealed to be due to her latent Banshee heritage that was activated by the trauma of his attack. Eager to gain more power by creating a pack after hearing rumor that the Alpha Pack planned to come to Beacon Hills to recruit him, Derek voluntarily gave the Bite to four teenage high school students in the following order: Jackson Whittemore, Isaac Lahey, Erica Reyes, and Vernon Boyd. Though the latter three successfully transformed into Werewolves, the former became a mutated type of shapeshifter known as a Kanima due to his unresolved identity issues, putting him in a vulnerable position that allowed him to be manipulated by fellow classmate Matt Daehler and the Argent patriarch Gerard Argent, who had just returned to town following the "death" of his daughter, Kate.
Upon defeating Gerard and turning Jackson into the Werewolf he was meant to be, the supernatural community continued to expand, as the Alpha Pack (consisting of leader Deucalion and subordinates Kali, Ennis, Ethan, and Aiden) returned to Beacon Hills to try to recruit both Derek and Scott to their ranks, as the latter had just been revealed to have the potential to be a very rare True Alpha Werewolf (a Werewolf who rises from Beta to Alpha purely due to the strength of his own will), and the former was a powerful Hale Alpha. ("Tattoo"), ("Currents")
To make matters more complicated, a Dark Druid known as a Darach also showed up in town and began performing a sacrifice ritual that involved killing trios of different groups to increase her powers. Once it was revealed that the Darach was Jennifer Blake, the English teacher at the high school and Kali's former Emissary, Scott and Derek were forced to side with Deucalion and Jennifer, respectively, to take care of the other threat. Fortunately, both the Alpha Pack and Jennifer were defeated with the combined efforts of the newly-formed McCall Pack and the remains of the Hale Pack, two groups who ultimately merged by the end of the conflict. ("Unleashed"), ("The Girl Who Knew Too Much"), ("Alpha Pact"), ("Lunar Ellipse")
However, the surrogate sacrifice ritual that Scott, his human friend Stiles Stilinski, and his Hunter friend and ex-girlfriend Allison Argent performed in order to save their parents from being sacrificed by Jennifer not only reawakened the Nemeton, but it also allowed the Nogitsune Noshiko Yukimura had imprisoned there nearly seventy years earlier to escape from its cage and possess Stiles. ("Anchors"), ("The Fox and the Wolf")
As a result, Noshiko summoned roughly half a dozen Oni demons to Beacon Hills in order to identify the Void Kitsune's host and eventually defeat it, though by the time she learned it was Stiles, the Nogitsune had become too powerful for the Oni to slay. ("Silverfinger"), ("Letharia Vulpina") Once the Nogitsune took control of her Oni, it was only due to the combined efforts of the McCall Pack and their allies that the Dark Kitsune was neutralized after Scott had changed his host by giving him the Bite, followed by Kira Yukimura stabbing him with her magical katana. This vessel crumbled into ash, and the spirit of the Nogitsune took the form of a fly, which was then trapped in an urn made of wood from the Nemeton as its new prison. ("Insatiable"), ("The Divine Move")
It was not long before chaos descended upon Beacon Hills once again, this time due to the Deadpool, a hit-list of thirty-six supernatural creatures funded by $117 million in bearer bonds that were stolen from the Hale Vault around January 2012; individual bounties on the list ranged from as low as $250,000 up to as much as $25,000,000. ("The Benefactor (Episode)"), ("117") On the list were all the supernatural members of the McCall Pack, Satomi's Pack, and other unaffiliated supernaturals who also lived in Beacon Hills and had flown under the radar for some time, such as the Walcott family of Wendigos. At least a dozen of the people on the list were killed before the computers running the Deadpool code were shut down by Stiles Stilinski and Malia Tate, once again leading Beacon Hills to experience several months of relative peace before the next supernatural event occurred. ("Monstrous")
In late summer and early autumn of 2012, Beacon Hills citizens witnessed an influx of what appeared to be mutated supernatural creatures who did not obey the normal laws of the supernatural, such as not having a vulnerability to Mountain Ash. ("Creatures of the Night"), ("Parasomnia") It was soon revealed that human teenagers with genetic chimerism were being turned into pseudo-supernatural Chimeras, also known as humans who had been given the powers and traits of two or more supernatural species by the Dread Doctors, who transformed them using scientific means rather than mystical ones. ("Condition Terminal")
Though their ultimate mission was initially unclear, the McCall Pack eventually learned that the Doctors were attempting to create the perfect vessel for the famous Beast of Gevaudan, a vicious and demonic Werewolf named Sebastien Valet who had been killed in 1767 by Marie-Jeanne Valet, Sebastien's sister and the progenitor of the Argent bloodline of Hunters. Though the Dread Doctors successfully found this vessel in Mason Hewitt, the combined efforts of Lydia Martin, who Banshee-screamed Mason back into control of his body, Jordan Parrish, who held the Beast down, and Scott McCall, who impaled the Beast with the mystically-powered pike, managed to kill the Beast once and for all to end his reign of terror across Beacon Hills, which took the lives of at least fifty people.
Near the end of this event, Beacon Hills began experiencing severe thunderstorms with five times the normal number of lightning strikes for over three months. ("Relics") It was soon revealed that this was due to the arrival of the Ghost Riders of the Wild Hunt, who came to Beacon Hills for yet-unknown reasons and began wreaking havoc by capturing people, sending them to a mystical pocket dimension known as the Phantom Train Station, and then erasing nearly every trace of their life from existence, including making their personal belongings invisible, altering the memories of everyone the victim knew so they forgot the victim's existence, and warping reality to remove any trace of their identity from documents such as library access cards, yearbook forms, and deeds to houses. ("Memory Lost"), ("Superposition"), ("Sundowning") It appears that Beacon Hills is just one of dozens of towns that have been visited and terrorized by the Ghost Riders, including other towns such as Anderson, Baybury, Canaan, Deer Ridge, Hollantine, King Springs, Red Oak, and Trenton, among many others.
It was then discovered that the Wild Hunt were stuck in Beacon Hills and are unable to move on as long as there is still someone left behind. Over the course of several weeks, nearly everyone in the town has been captured, though the erasure of their existence has become less effective as time has gone on. ("Blitzkrieg") However, when Garrett Douglas, an Alpha Löwenmensch who had stolen the powers of a Ghost Rider, used his new powers, the powers of the Hellhound Jordan Parrish, and the powers of the Chimera Corey Bryant to try to merge the Ghost Riders' Phantom Train Station with the real world, causing train tracks to appear throughout the town. The members of the McCall Pack, who had been separated between the two dimensions, worked together with recent allies Peter Hale and Theo Raeken to fight the Ghost Riders, and ultimately stopping them by diverting the train. Afterward, the Ghost Riders' turned Garrett into one of their own kind before leaving Beacon Hills, returning all of its citizens to the town and restoring their memories.
Just as the older members of the McCall Pack were about to leave to attend their respective colleges, a new supernatural being was discovered to have escaped from the Wild Hunt when they saved Stiles and the other town citizens. This creature was soon revealed to be the Anuk-ite, an ancient shapeshifter with the power to cause fear in others as well to empower himself with the emotion. The Anuk-ite also was known as a two-faced creature, and it manifested by stealing the DNA of two teenagers, one of whom (Aaron) was a human and the other of whom (Quinn) was a Werewolf.
Because of the amplified fear throughout town caused by the Anuk-ite, Tamora Monroe, a survivor of the Beast of Gevaudan's second reign, joined the Hunter life, allowing Gerard Argent to both mentor and influence her as she built up a Hunter Army dedicated to the ultimate goal of wiping all supernatural creatures from existence. Though she managed to recruit what seemed to be the entire human population of the town, the defeat of the Anuk-ite caused most of them to lose the fear that was driving them to hate the supernatural community and realize that they had more in common than they originally believed.