Monsters & Villains
Primary Classes
These are the most common Object Classes used in SCP articles, and make up the bulk of the objects.
Safe
Safe-class SCP objects are anomalies that are easily and safely contained. This is often due to the fact that the Foundation has researched the SCP well enough that containment does not require significant resources or that the anomalies require a specific and conscious activation or trigger. Classifying an SCP as Safe, however, does not mean that handling or activating it does not pose a threat.
Euclid
Euclid-class SCP objects are anomalies that require more resources to contain completely or where containment isn't always reliable. Usually this is because the SCP is insufficiently understood or inherently unpredictable. Euclid is the Object Class with the greatest scope, and it's usually a safe bet that an SCP will be this class if it doesn't easily fall into any of the other standard Object Classes.
As a note, any SCP that's autonomous or sapient is generally classified as Euclid, due to the inherent unpredictability of an object that can act or think on its own.
Keter
Keter-class SCP objects are anomalies that are exceedingly difficult to contain consistently or reliably, with containment procedures often being extensive and complex. The Foundation often can't contain these SCPs well due to not having a solid understanding of the anomaly, or lacking the technology to properly contain or counter it. A Keter SCP does not mean the SCP is dangerous, just that it is simply very difficult or costly to contain.
Thaumiel
Thaumiel-class SCP objects are anomalies that the Foundation specifically uses to contain other SCPs. Even the mere existence of Thaumiel-class objects is classified at the highest levels of the Foundation, and their locations, functions, and current status are known to few Foundation personnel outside of the O5 Council.
Secondary Classes
The following object classes are less frequently used, and designate anomalies with unusual containment requirements. These secondary classes may also be described as esoteric classes, in addition to many other esoteric classes used even less frequently.
Apollyon
Apollyon-class SCP objects are anomalies that cannot be contained, are expected to breach containment imminently, or some other similar scenario. Such anomalies are usually associated with world-ending threats or a K-Class Scenario of some kind, and require a massive effort from the Foundation to deal with.
Archon
Archon-class SCP objects are anomalies that could theoretically be contained but are best left uncontained for some reason. Archon SCPs may be a part of consensus reality that is difficult to fully contain, or may have adverse effects if put into containment. These SCPs are not uncontainable - the defining feature of the class is that the Foundation chooses to not put the anomaly into containment.
Cernunnos
Cernunnos-class SCP objects could be functionally contained, but for logistical or ethical reasons the Foundation has chosen not to at this time. The anomaly may still be partially contained or actively concealed from the public, but the costs of fully containing it are deemed to outweigh the benefits.
Ticonderoga
Ticonderoga-class SCP objects cannot be contained, but also do not need to be contained. While these anomalies are similar to Archon-class SCPs in that their containment is unnecessary, Ticonderoga-class SCPs are distinguished by also not being containable given the Foundation's current knowledge and resources. This may be due to their widespread or ubiquitous occurrence on Earth, despite the general public remaining unaware of their existence or anomalous nature, although the Ticonderoga class also includes extraterrestrial anomalies beyond the current reach of the Foundation.
Non-Standard Object Classes
Most of the following Object Classes indicate that an SCP has not yet been assigned a standard object class, or that it was previously assigned a Standard Object Class but no longer requires containment. There are also additional Object Classes that are used less frequently than the ones listed above, known as Esoteric or Narrative object classes.
Explained
Explained SCP objects were formerly classified as anomalies before being completely and fully understood, to the point where their effects are now explainable by mainstream science, or were falsely identified as an anomaly before being debunked as a hoax or misunderstanding. While most of these articles are listed separately as Explained SCPs, a mainlist SCP may be reclassified as Explained after further investigation into the apparent anomaly.
Neutralized
Neutralized SCP objects were classified as anomalies but are no longer anomalous, due to the object being intentionally or accidentally destroyed or disabled, or simply due to its anomalous properties or effects ceasing.
Decommissioned
Decommissioned SCP objects are anomalies that have been intentionally destroyed or stripped of their anomalous properties by the SCP Foundation. As the Foundation usually tries to contain rather than neutralize anomalous objects, this object class is only used when it is not possible to fully contain an anomaly, or when excessive expenditure of resources is required to keep an anomaly in containment. Decommissioning may also be performed for ethical reasons, particularly when containment necessitates extreme suffering or is unable to prevent excessive loss of life. To avoid any unnecessary losses, decommissioning anomalies requires authorization from a higher authority, such as the O5 Council, the Ethics Committee, or the Decommissioning Department.
Pending
SCP objects that have not yet been assigned an object class may be labelled as Pending. This is used to indicate that the Foundation does not currently have enough information to assign an object class to the anomaly. This is a deliberate decision to emphasize that research is ongoing, and is not the same as the author simply not knowing which object class to assign!
Uncontained
SCP objects that are not yet contained may be assigned an object class, often Keter, but in some articles Uncontained is used in place of an object class to emphasize that ongoing effort is required to establish or restore containment.
SCP-001 The Gate Guardian (one of many proposals) Keter/Apollyon A gigantic humanoid figure wielding a flaming sword, standing near a giant structure (the 'Gate') in the Middle East. It prevents anyone from approaching the structure and acts as a protector or a harbinger of the end.
SCP-049 Plague Doctor Euclid A humanoid figure in 15th-century plague doctor attire. It believes it is curing humanity of the "Great Pestilence." Its touch is lethal, causing death and subsequent reanimation as a zombie-like entity (SCP-049-2).
SCP-055 [Unknown] Keter A self-keeping secret. It is impossible to remember any information about it, except for what it is not (e.g., it is not spherical, it is not blue, etc.). The Foundation knows they have it, but they can't remember what it is.
SCP-096 The Shy Guy Euclid/Keter A tall, gaunt humanoid. If its face is observed, either directly or via photo/video, it enters a state of extreme distress and will rapidly pursue the observer anywhere on Earth to violently kill them.
SCP-173 The Sculpture Euclid A concrete and rebar statue. When unobserved (not in a line of sight), it is extremely fast and will snap the necks of any people in its immediate vicinity. It is the original SCP.
SCP-682 Hard-to-Destroy Reptile Keter A massive, hostile, and highly intelligent reptilian creature. It possesses hyper-fast regeneration and adaptation, making it impossible to destroy, despite numerous attempts by the Foundation. It hates all life
.
SCP-999 The Tickle Monster Euclid (Safe-leaning) A large, friendly, orange, amorphous blob of slime. It secretes a euphoria-inducing substance and enjoys tickling and comforting people. One of the Foundation's few truly benevolent SCPs.
SCP-3000 Anantashesha Thaumiel (As previously summarized) A gigantic, hostile, amnesic-secreting eel used by the Foundation to harvest memory-wiping drugs (Y-909).
SCP-106: The Old ManAttributeDetailsObject ClassKeter (Extremely difficult to contain, with high risk of breaches)Danger LevelImmediate, Extreme (Breaches often result in dozens of casualties and require high-priority containment protocols.)SummarySCP-106 is an elderly, decaying human male figure with a terrifying, viscous, black substance covering his entire body. He is highly sadistic, intelligent, and seems to enjoy hunting and tormenting his victims.Anomalous PropertiesCorrosive "Pocket Dimension" and Phasing.
1. Corrosion: Any solid matter he touches instantly begins to severely corrode, dissolve, and decay, often smelling like rot and emitting a black mucus. This corrosion can bypass materials and is permanent.
2. Pocket Dimension: He can phase through solid matter and enter a self-created, poorly understood "pocket dimension" (referred to as a "limbo state" or "corrosive realm"). He uses this dimension to stalk victims and reappear instantly anywhere connected by a surface he has touched.
SCP-035: The Possessive MaskAttributeDetailsObject ClassKeter (Extremely dangerous and difficult to contain due to its mental and physical corruption effects.)Danger LevelPsychological/Contagious (High-risk of mass mental casualties and structural failure.)SummarySCP-035 is an antique, white porcelain tragedy mask. When viewed from the back, it appears to shift and change into a comedy mask. A black, highly corrosive and putrid liquid constantly oozes from the eye and mouth holes.Anomalous PropertiesPossession and Mental Manipulation.
1. Possession: If a human places the mask over their face, the person's brain functions immediately cease, and the mask effectively possesses the host's body. The host is still conscious but has no control.
2. Mental Influence: The mask, while possessing a host, is highly charismatic, intelligent, and persuasive. It possesses an immense knowledge of history and languages and attempts to gain the Foundation's trust to learn more about other anomalies and eventually facilitate an escape.3. Body Degradation: The possessed body rapidly degrades and decays into a mummified, lifeless state. This process is often irreversible and extremely fast, leaving the host's organs liquid and their bones brittle, requiring the mask to seek a new host frequently.
SCP-610, also known as "The Flesh that Hates," is a Keter-class contagious skin disease initially discovered in Southern Siberia near Lake Baikal. The infection begins as a rash or itch that rapidly escalates into heavy scar tissue covering the entire body. Within hours, the victim's vital life functions cease, but they do not die; instead, the infection takes over their motor functions. The victim transforms into a mindless, aggressive entity whose only goal is to spread the contagion and expand the mass of the infection.
As the disease progresses, the infected subjects undergo horrific physical mutations. They may sprout extra limbs, grow new sensory organs, or have their heads split open, often merging with other infected individuals to form massive, multi-limbed monstrosities. The infection is not limited to humans or animals; it aggressively terraforms the environment, turning trees, buildings, and the ground itself into a pulsating, living landscape of flesh and bone. The infected entities exhibit a form of hive-mind intelligence, working together to capture new hosts and protect the central infection.
Because there is no known cure and the infection spreads rapidly through physical contact, the Foundation focuses on containment rather than treatment. A strictly guarded perimeter has been established around the infection zone in Russia to prevent anything from entering or leaving. The Foundation utilizes incendiary weapons and heavy ordinance to burn back the growth if it attempts to expand beyond the established boundaries, as a full containment breach could result in a global scenario where all life is converted into infected biomass.