A Comprehensive List of K-Class Scenarios
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K-Class Scenarios are hypothetical situations that could have drastic effects on normality or reality, including the end of the world. The Foundation games out what can happen in these events, and authors on the wiki often reference these contingency plans… or times they have failed.

This collaborative page exists to document all K-Class Scenarios used on the wiki.

Disclaimers

  • There is no canon definition for any K-Class Scenario. This page should not be seen as a "canonical" resource. Please do not hassle authors for "misusing" these scenarios.
  • This list is meant to be descriptive, not prescriptive. Definitions are based on usage in articles, not what anyone thinks they should mean. (For earlier lists with invented definitions, scroll down.)

A bit on notation: (I treated any of these grammatical variants as equivalent.)

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Each of these letter combinations have been used at least twice on the wiki. They are presented alphabetically by K-Class followed by non-K designations and oddities. (GH gets to be special by seniority).

For one-off scenarios and versions seen only in -Js, scroll down.

Scenarios with *'s have appeared at least 5 times with a consistent definition.
Scenarios with ©'s have appeared at least 10 times with a consistent definition, and could be considered "well-established." Also you have to pay me 5¢ to use them.
Scenarios with 🎖️'s have appeared at least 100 times with a consistent definition, and could be considered "prominent."



These scenarios were created for the 2018 Doomsday Contest. If you were a team member for a scenario, please feel free to provide a definition or otherwise update your apocalypse! (Also maybe double-check links, some of these SCP numbers were very similar.)

Edit: Some of these (such as ΩK and EDK) have gone on to become part of extensive canons, so I have added links to tags for people who want to explore them deeper.

*'s represent scenarios with 5+ articles on the contest page (Again, please update! I just used the hub out of laziness- expediency.)



Scenarios that have only appeared in one article.

Title Definition Articles
AE-K Class "Atlantis-Alethia 'Amnestics Absolution' Event Escalation" Scenario Also known as an Alethia Event, it causes humans outside of the Veil to recall memories of encountering the anomalous along with their amnesticization. It is similarly related to Lethe Events, although there seems to be no correlation between the rates of both events. SCP-055-INT
AS-Class Normalcy Alteration Scenario The lives of people are altered significantly by non-anomalous things, such as the internet. SCP-3368
AU-Class End of The World Scenario The result of testing SCP-475 with Australian Church of Australia's Religion SCP-475
AZK-Class Universal De-Actualization Scenario The universe becomes relatively hypothetical, as a result of pulling entities from hypothetical space. SCP-7881
BB-Class Universal Formation event The creation of the universe in a 'Big Bang' scenario. SCP-4417
BC-Class Universal Collapse event The natural end of the universe in a 'Big Crunch' scenario. SCP-4417
CCK-Class Copyright Infringement Lawsuit Scenario The SCP-Wiki is sued out of existence in real life. CCK-class "Copyright Infringement Lawsuit" Scenario
⚳θ-Class Scenario Loop An event that occurs reliably with a deity on certain dates or seasons. SCP-5327
δK-class "Really Bad Time" Scenario N/A SCP-5764
ϝK-Class "Paradoxysm" Scenario An extreme, localized, metastable Copenhagen decoherence event. SCP-7243
DT-Class Split Timeline scenario Rare (and non-apocalyptic) event in which the timeline branches into two parallel causalities. Most frequently caused by the malfunction of Temporal Distortion Engines. SCP-3176
DVK-Class Reality Negation Scenario The "in-universe" erasure of certain events, entities, or phenomena from narrative-space-time due to the article containing them being deleted from the SCP Foundation wiki. SCP-9020
EB-Class Ontological Breakdown N/A SCP-2721
EI-K-Class Informational Breakdown scenario One or more methods of information transfer become irreparably compromised. SCP-3317
EP-class "Thought Tyrant" scenario A significant part of human thinking is dominated by a single entity, group or person. SCP-4228
Great Convergence (GC) K-Class Scenario As a result of the breaking down of barriers between realities, multiple realities merge resulting in the likely destruction of all universes involved. SCP-7805
Gimel-Class Mass-Dementia Scenario N/A SCP-3493
Götterdämmerung Scenario N/A SCP-319
Inter-Reality Paradox scenario N/A SCP-3493
KF-Class Nomenclative Breakdown Scenario N/A SCP-PL-253
MF-Class "Spilled Milk" Scenario Witnessed only in a dream. Based on the archetype of "The Flood"; a biblical flood composed of milk. SCP-3739
Mulberry-Class "End of Predation" Scenario N/A SCP-7472
O0-Class Ontological Shift Scenario N/A SCP-4634
Oak-Class "Endless Nuts" Scenario N/A SCP-7472
PHK-Class "Specter Storm" Multiplanetary-Attack Scenario The collective ghosts of a large group begin to haunt the entirety of several planets. SCP-6533
PT-Class Paradoxical Time Breakdown Scenario An event where a harmful time paradox has occurred causing time and/or the timeline to be "broken". SCP-4255,
Shin-Sophist "Global Religious Dissolution" Scenario The subversion or dismantlement of humanity's religious institutions and dogmatic beliefs en masse. SCP-4519
SK-ε-class ("Invasion") scenario A scenario when an extraterrestrial species invades or intercepts humanity. SCP-6812
SMK-Class "One Versus Everyone" Scenario A single entity perceives the Foundation as a threat and attempts to destroy it in its entirety, resulting in a breach of the Veil. SCP-4640
Sycamore-Class "Squirrel-d Peace" Scenario N/A SCP-7472
θ-Class Scenario Events caused or suffered by or because of a deity. SCP-5327
class TCF (Total Contaminant Failure) N/A SCP-2470 (RU)
XD-Class Scenario N/A SCP-5488
χK-Class ("Crowning-of-Death") Scenario The inadvertent containment breach of SCP-4260, resulting in universal supremacy of Death and the probability of life's continuation becoming approximately zero. SCP-4260
תK-Class Scenario N/A Kate McTiriss's Proposal
██-class end of the world scenario N/A SCP-1000
█K-class scenario N/A SCP-453
Vaxt τ-Class "Chronography Change" Scenario A temporal paradox is formed, altering the present timeline due to actions in the past. SCP-4437
UZ-Class Grey Goo scenario See NK Noir Box Proposal
𝑥k-Class Lack of Consistency Scenario Occurs when all consistency within the Foundation fails. SCP-6727
ΨK-Class "Unjust Verdict" Scenario A scenario in which the status quo shifts dramatically as a result of anomalously altered laws. SCP-7403
ØK-class Artistic Singularity Event All instances of human art are altered into a single form. SCP-7933
CIK-Class Insurgency War Scenario The Chaos Insurgency's main goal becomes to ensure the complete eradication or takeover of the SCP Foundation. SCP-8065
DBK-Class Complete Database Loss Scenario The SCP Foundation database is completely lost, and unable to be restored without recreating the files from scratch, or at all. SCP-8065
WC-class "War for Civilization" Scenario A war engulfs all of complex sedentary civilization, the outcome of which will determine if such civilization will continue existing. War may be between diffrent cultures or against anomalous elements. More likely to occur during early civilizational development. SCP-7304

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