Slender Man: From Creepypasta to Conspiracy

On June 10, 2009, a man named Eric Knudsen sat down at his computer and entered a Photoshop contest on the Something Awful forums. The challenge was simple: take ordinary photographs and make them paranormal. He posted two black-and-white images of children playing, doctored to include an impossibly tall, faceless figure in a dark suit lurking in the background. He added some fake witness testimony for flavor. He called his creation “The Slender Man.”

Fifteen years later, that forum post has generated hundreds of thousands of pages of collaborative fiction, inspired a feature film, an HBO documentary, multiple video games, and a YouTube series with hundreds of millions of views. It also inspired two twelve-year-old girls to lure their best friend into the woods and stab her nineteen times.

The Slender Man saga is one of the strangest stories the internet has ever produced — not because the monster turned out to be real (he didn’t), but because it proved that in the age of viral media, the distinction between “real” and “fictional” might matter less than we’d like to believe. And naturally, once blood was spilled, the conspiracy theories came pouring in like comments on a Reddit thread with a locked controversial tag.

Origins: The Something Awful Post That Started Everything

The Something Awful forums, for the uninitiated, were one of the internet’s original breeding grounds for creative weirdness. Founded by Rich “Lowtax” Kyanka in 1999, the forums required a $10 registration fee — a paywall that, counterintuitively, cultivated one of the more literate and creative communities online. SA forums spawned or popularized a remarkable number of internet phenomena, from Let’s Play videos to the SCP Foundation.

On June 8, 2009, a user named Gerogerigegege started a thread in the SA forums’ “Create Paranormal Images” contest. The premise was elegant: take real photographs and Photoshop something creepy into them, then present the results as if they were genuine paranormal documentation. Users contributed doctored photos of ghosts, shadow figures, and cryptids. It was collaborative horror art, and it was fun.

Two days later, on June 10, Eric Knudsen — posting under the username “Victor Surge” — submitted two entries that changed internet culture forever. The first showed a group of children at a playground, with an unnervingly tall, thin figure visible between the trees behind them. The second depicted children being led away, with the same figure lurking in the background. Knudsen accompanied the photos with invented quotes from survivors and investigators, lending them a mockumentary quality that elevated them above the typical Photoshop job.

The character he created was striking in its simplicity: impossibly tall, thin to the point of emaciation, wearing a black suit, with a featureless white face. Sometimes tentacle-like appendages seemed to sprout from his back. He appeared near children. He appeared in forests. He appeared in the background of old photographs, as if he’d always been there.

What made Slender Man work — what made him stick in the collective imagination like a splinter — was what Knudsen left out. The character had no backstory, no motivation, no explanation. He was a blank canvas of dread. He didn’t want anything specific. He just was. And that openness was an invitation.

Other Something Awful users immediately began adding to the mythology. Within days, the thread was filling with new Slender Man photos, new witness accounts, new lore. Someone decided he stalked children specifically. Someone else connected him to Germanic fairy tales about der Großmann, a faceless boogeyman of the Black Forest. (This connection was entirely fabricated, which is important.) Someone added that looking at him — or knowing about him — drew his attention. A memetic hazard, in the parlance of the SCP Foundation, another collaborative fiction project with roots in the same community.

Eric Knudsen had created a character. The internet made him a myth.

The Collaborative Mythology

What happened next was unprecedented in the history of folklore. Slender Man didn’t evolve over centuries of oral tradition, whispered around campfires and passed down through generations. He evolved over months, in forum threads and wiki pages and YouTube comments, iterated on by thousands of anonymous contributors simultaneously. It was open-source horror.

Marble Hornets

The most significant amplifier of the Slender Man mythos was Marble Hornets, a YouTube series that began in June 2009 — the same month as Knudsen’s original post. Created by Troy Wagner, Joseph DeLage, and Tim Sutton, Marble Hornets presented itself as found footage: a film student named Jay discovers disturbing tapes left behind by his friend Alex, which seem to document encounters with a tall, faceless figure called “The Operator.”

The series ran for five years and 92 entries, accumulating hundreds of millions of views. It was remarkably well-made for a micro-budget web series, and it established many of the Slender Man tropes that would become canon: the audio and video distortion that accompanied his presence, the “proxies” (people driven mad and controlled by the creature), the obsessive documentation spiral where investigating the phenomenon drew you deeper into it.

Marble Hornets essentially gave Slender Man his narrative framework. Before it, he was a creepy image. After it, he was a story — one with characters, stakes, and internal mythology.

The Creepypasta Ecosystem

Simultaneously, Slender Man was colonizing the broader creepypasta ecosystem. The Creepypasta Wiki, established in 2010, became a central repository for amateur horror fiction, and Slender Man stories were among its most popular offerings. The Slender Man Wiki catalogued every piece of lore, every appearance, every interpretation. Writers on DeviantArt, Reddit, and Tumblr contributed their own Slender Man fiction. Artists drew him. Cosplayers dressed as him.

The Slenderman video game (2012), a bare-bones but deeply effective first-person horror experience, introduced the character to millions of players who had never visited Something Awful or read a creepypasta. You wandered through dark woods, collecting pages, while the suited figure materialized at the edge of your flashlight beam. It was simple, terrifying, and wildly successful, spawning sequels and imitators.

By 2013, Slender Man was everywhere. He’d transcended his origins completely. Most of the people who knew about him had no idea he’d been born in a Photoshop thread. He existed the way urban legends have always existed — as a story people tell each other, with each telling adding new details, new rules, new terrors. The difference was that this process, which once took generations, had been compressed into four years of internet time.

And here’s the thing about collaborative fiction that exists in the same information space as news, Wikipedia articles, and YouTube documentaries: the line between “story” and “fact” isn’t always where you think it is. Especially when you’re twelve.

The Waukesha Stabbing

On the morning of May 31, 2014, in the Milwaukee suburb of Waukesha, Wisconsin, twelve-year-old Payton Leutner went into the woods with her two best friends, Morgan Geyser and Anissa Weier. They’d had a sleepover the night before to celebrate Morgan’s birthday. They were going to play hide-and-seek.

What happened in those woods was not a game.

Morgan Geyser stabbed Payton Leutner nineteen times with a five-inch kitchen knife. The blade struck her arms, legs, and torso, missing a major artery by less than a millimeter. Anissa Weier had helped plan the attack and lured Payton to the spot where Morgan was waiting. Afterward, the two girls left their bleeding friend in the undergrowth and walked toward the highway, heading, they later told police, for Slender Man’s mansion, which they believed was somewhere in the Nicolet National Forest in northern Wisconsin.

Payton Leutner crawled out of the woods and reached a road, where a passing cyclist found her. She survived, despite losing a dangerous amount of blood, and was hospitalized for six days. She bore nineteen stab wounds. She was twelve years old.

Morgan and Anissa were found walking along Interstate 94 several hours later. When questioned by police, they explained calmly that they had attempted to kill Payton to prove their loyalty to Slender Man. They believed that by committing murder, they would become his “proxies” — a term straight from Marble Hornets — and be allowed to live in his mansion in the forest. They believed he would harm their families if they didn’t comply.

They had been planning the attack for months.

The trial, which stretched over three years due to competency hearings and the complexity of trying juveniles as adults in Wisconsin, revealed a deeply disturbing picture. Morgan Geyser was diagnosed with early-onset schizophrenia. She had been experiencing hallucinations and delusions for years — hearing voices, seeing figures that weren’t there — and had come to believe that Slender Man was one of many fictional characters who were actually real and communicating with her. She also believed she could see and communicate with Lord Voldemort and one of the Teenage Mutant Ninja Turtles. Her parents had no idea.

Anissa Weier, while not diagnosed with schizophrenia, exhibited what psychologists described as a shared delusional disorder. She had been drawn into Morgan’s belief system, a phenomenon sometimes called folie à deux. She became convinced of Slender Man’s reality not through hallucination but through a combination of Morgan’s persuasiveness, the overwhelming volume of Slender Man content online, and the natural credulity of a twelve-year-old navigating the internet without meaningful guidance.

In December 2017, Morgan Geyser was sentenced to 40 years in a mental health institution. Anissa Weier received 25 years. Both sentences were for attempted first-degree intentional homicide. Payton Leutner, miraculously, made a full physical recovery and later gave interviews about forgiving her attackers.

The case is genuinely tragic from every angle. Two mentally ill children tried to murder their friend because they couldn’t distinguish fiction from reality. And the reason they couldn’t distinguish fiction from reality had everything to do with how the internet presents information — and nothing to do with conspiracy theories.

But that didn’t stop the conspiracy theories.

The Conspiracy Theories

In the aftermath of the Waukesha stabbing, several interconnected conspiracy theories emerged, each building on the others like a layer cake of paranoia.

Slender Man Is Real

The most straightforward theory — and the one that says the most about human psychology — was the claim that Slender Man was actually real. Proponents pointed to the Waukesha stabbing as evidence: if Slender Man were merely fiction, why would children kill for him? The argument was circular, but that’s never stopped a conspiracy theory before.

Self-proclaimed paranormal investigators claimed to have photographic evidence of Slender Man sightings in forests, abandoned buildings, and playgrounds around the world. (These photos were invariably blurry, taken from a distance, and bore a suspicious resemblance to a tall person in a suit.) Some theorists claimed that Knudsen hadn’t created Slender Man but had been inspired by a real entity — that his Photoshop work was unconscious channeling rather than creative imagination.

This theory required ignoring the entire documented timeline of Slender Man’s creation on the Something Awful forums, but its advocates were happy to oblige.

The Government Psyop Theory

More elaborate was the claim that Slender Man was a deliberately engineered psychological operation — a government psyop designed to test the power of memetic warfare on children. According to this theory, the character’s creation on Something Awful was not spontaneous but orchestrated, either by the CIA, DARPA, or some unspecified intelligence agency interested in weaponizing internet fiction.

Proponents of the psyop theory pointed to several allegedly suspicious facts:

• Something Awful was founded in 1999, the same year DARPA began funding early social media research
• The Slender Man mythos spread with “suspicious efficiency,” suggesting coordinated amplification
• The character’s design incorporated elements of psychological terror (facelessness, unnatural proportions) that were “too sophisticated” for a casual Photoshop edit
• The CIA’s documented history of mind control experiments (MKUltra, Project Monarch) proved the government was interested in psychological manipulation

This theory essentially proposed that the United States government had invented a fictional boogeyman, seeded it into internet culture, and then sat back to watch what happened when children encountered it. The goal, depending on which theorist you asked, was either to test memetic weapons, justify internet censorship, or distract the public from real conspiracies.

The theory’s fundamental weakness — besides the complete absence of evidence — was that it required believing the intelligence community was capable of predicting the viral spread of a forum post five years before it resulted in violence. If the CIA could do that, they wouldn’t need psyops; they’d just play the stock market.

The Coordinated Exposure Theory

A gentler version of the psyop theory held that while Slender Man’s creation might have been organic, there was a coordinated effort — by tech companies, media conglomerates, or some shadowy interest group — to deliberately expose children to violent and disturbing content online. In this reading, Slender Man was just one weapon in an arsenal of digital poison targeting young minds.

This theory gained traction because it was built on a kernel of truth. Tech companies did design their platforms to maximize engagement, and their algorithms did serve disturbing content to children without meaningful age-gating. YouTube’s recommendation algorithm, in particular, was notorious for sending users — including children — down rabbit holes of increasingly extreme content. A child who watched one Slender Man video might be algorithmically funneled toward dozens more, each darker than the last.

But the theory jumped from “tech companies were negligent about children’s exposure to disturbing content” (true and well-documented) to “tech companies deliberately targeted children with psychologically weaponized fiction” (speculative and unsupported). The difference between negligence and malice is vast, even if the outcomes sometimes look similar.

The Something Awful–Intelligence Connection

The most baroque conspiracy theory connected Something Awful itself to intelligence agencies. This theory typically cited the fact that several SA forum alumni went on to prominent positions in media and technology — a circumstance that conspiracy theorists found suspicious rather than predictable for a forum that attracted creative, tech-savvy people in the early 2000s.

Some versions of this theory looped in the SCP Foundation, another collaborative fiction project with SA forum roots, arguing that the SCP Foundation’s structure (a fictional secret organization documenting anomalous phenomena) was suspiciously similar to actual classified programs. The implication was that the SCP Foundation and Slender Man were both “soft disclosure” — the intelligence community seeding real information into fictional frameworks so that anyone who stumbled on the truth would be dismissed as a nerd who’d read too many creepypastas.

This is the conspiracy theory equivalent of an Escher drawing: if you look at it long enough, it seems to make sense, but it’s impossible in three-dimensional reality.

The Tulpa Theory

Perhaps the most philosophically interesting — if scientifically bankrupt — conspiracy theory was the Tulpa Theory. Drawing on a (heavily distorted) interpretation of Tibetan Buddhist thought, some internet users proposed that Slender Man could become real through the sheer force of collective belief.

The concept of a tulpa in Tibetan Buddhism refers to an entity created through spiritual practice and intense meditation — a thoughtform given independent existence by a practitioner’s concentrated will. The idea was popularized in the West by Belgian-French explorer Alexandra David-Néel, who claimed in her 1929 book Magic and Mystery in Tibet to have created a tulpa of a jolly monk who gradually took on a life of his own and became sinister.

The internet Tulpa Theory proposed that millions of people thinking about Slender Man, writing about him, drawing him, and fearing him had generated enough psychic energy to bring him into existence. The Waukesha stabbing was not evidence that two disturbed children confused fiction with reality — it was evidence that Slender Man had become real and was now influencing vulnerable minds.

The theory spawned its own community. The /r/Tulpas subreddit, while not specifically about Slender Man, became a gathering point for people interested in the idea of creating sentient thoughtforms. Some users claimed to have created tulpas of their own — imaginary friends, essentially, that they insisted had achieved independent consciousness.

The Tulpa Theory is fascinating as a cultural artifact. It represents a collision between Western internet culture, badly misunderstood Eastern mysticism, and the very human desire to believe that stories have power beyond entertainment. It also represents a fundamental confusion between metaphor and mechanism. Believing in something very hard doesn’t make it real. If it did, Hogwarts would have a physical campus and the Avengers would be on the federal payroll.

Evidence and Debunking

The debunking of Slender Man conspiracy theories is unusually straightforward because the character’s creation is one of the most thoroughly documented acts of artistic creation in internet history.

Slender Man’s origin is on the record. The original Something Awful thread still exists. The posts are timestamped. The progression from Knudsen’s initial images to the collaborative mythology is visible in real time. Eric Knudsen has given multiple interviews confirming his authorship, discussing his creative process, and expressing dismay at the violence his creation inspired. There is no ambiguity about where Slender Man came from.

The Waukesha case has a clear clinical explanation. Morgan Geyser had early-onset schizophrenia that was undiagnosed at the time of the attack. Her inability to distinguish fiction from reality was a symptom of a serious mental illness, not evidence of supernatural influence. Anissa Weier’s participation is explained by well-documented psychological phenomena — shared delusional disorder, peer influence, and the particular vulnerability of adolescent cognition.

There is zero evidence of government involvement. No documents, no whistleblowers, no FOIA releases, no plausible mechanism. The psyop theory rests entirely on the post-hoc reasoning that because the government has conducted psychological operations in the past (true), this specific internet phenomenon must be one (logical fallacy).

The Tulpa Theory has no scientific basis. Collective belief does not create physical entities. This is not a controversial claim in any scientific discipline. The Tulpa Theory is a religious/metaphysical claim dressed up in the language of internet pseudo-empiricism, and it fails on both levels — it misrepresents Tibetan Buddhist thought and it misrepresents how physical reality operates.

What the Slender Man case does demonstrate, however, is genuinely concerning and doesn’t require conspiracy theories to explain:

• The internet can present fiction and fact in identical packaging
• Children are particularly vulnerable to this ambiguity
• Tech platforms in the 2010s did almost nothing to protect minors from disturbing content
• Collaborative fiction can create mythology faster than any society can develop defenses against it
• Untreated mental illness in children can have devastating consequences when combined with unrestricted internet access

These are real problems. They just aren’t conspiracies.

Cultural Impact

The Waukesha stabbing transformed Slender Man from an internet curiosity into a national conversation about digital safety, childhood mental health, and the power of online content. The coverage was enormous — and, predictably, often terrible.

Cable news segments treated Slender Man as if he were a new street drug, warning parents about the menace lurking on their children’s iPads. The moral panic that followed echoed earlier generational freak-outs about Dungeons & Dragons (1980s), heavy metal music (1980s–90s), and violent video games (1990s–2000s). In each case, the cultural product was blamed for violence that was actually attributable to untreated mental illness, and in each case, the panic eventually subsided without the predicted civilizational collapse.

HBO’s documentary Beware the Slenderman (2016), directed by Irene Taylor Brodsky, took a more thoughtful approach. The film focused primarily on the families of Geyser and Weier, examining how two ordinary middle-class households in suburban Wisconsin ended up at the center of a national horror story. It explored the legal and ethical complexities of trying twelve-year-olds as adults and the broader question of parental responsibility in the digital age. The documentary was widely praised for its sensitivity and refusal to sensationalize.

Sony’s Slender Man movie (2018) was the opposite. Widely panned by critics and the public alike, the PG-13 horror film was so toothless that it managed to be neither scary nor interesting. It was also controversial: the father of one of the Waukesha attackers called it “extremely distasteful,” and the film’s marketing was pulled from some markets in Wisconsin. The movie made $51 million worldwide on a $28 million budget — a tepid performance that suggested audiences could tell when they were being exploited.

The case also influenced internet content policy. Creepypasta Wiki banned Slender Man content in the wake of the stabbing — not because the content itself was harmful, but because the community didn’t want to be associated with real-world violence. The decision was controversial, with many arguing it amounted to punishing fiction for the actions of disturbed individuals.

In academia, the Slender Man phenomenon generated serious scholarly interest. Folklorists were fascinated by the speed at which internet culture could generate what amounted to a new mythological figure. Jeffrey Tolbert’s work on Slender Man as “new legend” examined how collaborative digital storytelling was creating folklore in real time, compressing centuries of oral tradition into years of forum posts. Andrew Peck’s research on “ambiguous ostension” explored how the internet blurred the line between performing a legend and believing in it.

Morgan Geyser and Anissa Weier remain in institutional care. Payton Leutner graduated high school and has spoken publicly about her experience, advocating for mental health awareness and compassion. Eric Knudsen has largely withdrawn from public life, though he has stated that he never imagined his creation would lead to violence and that the Waukesha case causes him ongoing distress.

Timeline

• June 8, 2009: “Create Paranormal Images” thread begins on Something Awful forums
• June 10, 2009: Eric Knudsen (as “Victor Surge”) posts the first two Slender Man images
• June 2009: Marble Hornets YouTube series begins, massively amplifying the mythos
• 2010: Creepypasta Wiki launches; Slender Man stories among its most popular content
• 2012: Slender: The Eight Pages video game released; becomes a viral sensation
• 2013: Slender Man is one of the most-searched horror characters on the internet
• May 31, 2014: Morgan Geyser and Anissa Weier stab Payton Leutner 19 times in Waukesha, Wisconsin
• June 2, 2014: Geyser and Weier are arrested; during questioning, they cite Slender Man as their motivation
• August 1, 2014: Geyser and Weier are charged as adults with attempted first-degree intentional homicide
• 2014–2015: Conspiracy theories about Slender Man’s “reality” and government psyop origins proliferate online
• January 2016: HBO documentary Beware the Slenderman premieres at South by Southwest
• December 21, 2017: Anissa Weier sentenced to 25 years in a mental institution
• February 1, 2018: Morgan Geyser sentenced to 40 years in a mental institution
• August 10, 2018: Sony’s Slender Man film released; widely panned
• 2020: Tulpa theory communities reach peak activity on Reddit and Discord
• September 2024: Anissa Weier petitions for conditional release
• 2025: The Slender Man case continues to be studied in academic papers on digital folklore, moral panic, and adolescent psychology

Sources & Further Reading

• Knudsen, Eric. Original Something Awful forum posts, June 10, 2009
• Brodsky, Irene Taylor. Beware the Slenderman (documentary). HBO, 2016
• Chess, Shira, and Eric Newsom. Folklore, Horror Stories, and the Slender Man: The Development of an Internet Mythology. Palgrave Macmillan, 2015
• Tolbert, Jeffrey. “The Sort of Story That Has You Wishing: The Slender Man Meme and Internet Legend.” Semiotic Review 7, 2015
• Peck, Andrew. “Tall, Dark, and Loathsome: The Emergence of a Legend Cycle in the Digital Age.” Journal of American Folklore 128, no. 509, 2015
• The New York Times. “Girls Charged in Slender Man Stabbing.” June 2, 2014
• The Washington Post. “The Real Horror of Slender Man.” December 2017
• Waukesha County Circuit Court records. State of Wisconsin v. Morgan E. Geyser (Case No. 2014CF000983)
• Waukesha County Circuit Court records. State of Wisconsin v. Anissa E. Weier (Case No. 2014CF000984)
• David-Néel, Alexandra. Magic and Mystery in Tibet. 1929

Related Theories

The Slender Man case sits at the intersection of internet moral panics, tech platform accountability, and the weaponization of digital content. For related reading:

• Momo Challenge — another viral internet scare that became a full-blown moral panic about children and online content
• Blue Whale Challenge — alleged social media “suicide game” that followed similar patterns of media amplification and conspiracy theorizing
• Dead Internet Theory — the idea that most of the internet is fake, which Slender Man’s artificial mythology both predates and eerily prefigures
• Social Media Algorithm Addiction — the documented design of platforms to maximize engagement regardless of content harm
• MKUltra Mind Control — the real CIA mind control program frequently cited by those who believe Slender Man was a government experiment