TRANSLATE - 0024 - A Comprehensive List of K-Class Scenarios

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.)

+ show block

• Scenarios generally follow: <Letter>K-Class <description/end-of-the-world> scenario
• "K-class scenario" and "K-class event" seem to be used interchangeably. There's no consistent logic to it. Scenario was used about 4 times as often as event in my initial search.
• Capitalization (XK-Class End…, XK-class end…) and truncation (end-of-the-world, "end of the world", end of the world) don't seem to have any set standard.

Do you want to help?
Please do! This is a collaboration. See the steps below:

+So you want to link an article?

So you want to link an article?

• Please, please do this! My initial scraping only covered tagged SCPs, so tales and other articles need attention.
• Make sure the article is staying in the positive ratings (remaining at +1 or above for 24 hours) before adding the link: it's a pain to go through and clean up afterwards.
• If the article uses an existing prefix and fits a common definition, just add the link and update the count (# SCPs, # Tales, # Others). Maybe add the Alternative title if it's new and sounds cool.
• If the scenario is inconsistent with others in that prefix, OR is the first article using a prefix, OR only appears in a -J, please add it to the appropriate table using this format:

||~ Title ||~ Definition ||~ Articles ||
|| || || ||

• If you need a whole tab, here is a basic format:

[[tab prefix]]
**Most Common:** 
**Used in:** # SCPs, # Tales, # Other
**Primary definition:** 
**Alternative titles:** 
**SCPs:** 
**Tales and other articles:**

**Inconsistent Uses**
||~ Title ||~ Definition ||~ Articles ||
||  || || ||
[[/tab]]

+So you want to add or update a definition?

So you want to add or update a definition?
Maybe you were the author of a one-off or inconsistent-use scenario, or maybe you want to update a primary definition that is out of date. (Or, you know, if it could be better.) Go for it! Just remember:

• Definitions should be usage-based. Only create or update definitions to fit their use in articles.
• If the usage and title is really different from its current prefix, consider adding it to "Inconsistent Uses".
• It helps if you add a note down in the "Short description of changes:" before you hit "Save"
• Do not add definitions without a successful, linked article!

Scenarios With Multiple Uses

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.

AK*

Most Common: AK-class end-of-the-world scenario
Used in: 7 SCPs, 1 Tales, # Other
Primary definition: Related to a memetically spread behavior or "madness." Could be apocalyptic (e.g., people prioritize the behavior over eating/survival) or just radically reorient society around the behavior.

Some of these links just say "AK-class end of the world" without defining it.
Alternative titles: AK-class "madness" end of the world scenario

SCPs: SCP-1101, SCP-3443, SCP-571, SCP-1985, SCP-3060, SCP-1118-RU, SCP-4547
Tales and other articles: Reboot or: How I Learned to Stop Worrying and Love the Apocalypses

Inconsistent Uses

Title	Definition	Articles
AK-class scenario (Agricultural breakdown)		SCP-1623

ADK

Most Common: ADK-Class Full Anomalous Destabilization scenario
Used in: 1 SCP, 1 Tale, 0 Other
Primary definition: A general scenario which occurs when the "anomalous" reclaims the Earth. Typically occurs 1 to 3 years after an unspecified human extinction event or SK-Class Dominance Shift.
Alternative titles: N/A

SCPs: SCP-3309
Tales and other articles: UMBRAL_MIGRATORY_SEQUENCE.txt

CK©

Most Common: CK-Class Restructuring Scenario
Used in: 42 SCPs, 12 Tales, # Other
Primary definition: Reality is changed by a deity/reality bender/retrocausal altering of history/etc. These can be radical, broad changes representing a true end of the world, or small "localized" changes. (See also RK)
Alternative titles: CK-class Reality Restructuring Scenario, CK-class reality-ending scenario, CK-Class Reconfiguration event, CK-class restructuring of modern society, CK-Class ("End-of-Reality") Scenario

SCPs: SCP-1012, SCP-1237, SCP-140, SCP-1425, SCP-179, SCP-1968, SCP-1985, SCP-2046, SCP-2047, SCP-2311, SCP-2330, SCP-2743, SCP-2901, SCP-2975, SCP-3188, SCP-3189, SCP-3391, SCP-3426, SCP-3480, SCP-3498, SCP-3557, SCP-3600, SCP-3648, SCP-3672, SCP-3739, SCP-3742, SCP-3797, SCP-3919, SCP-3936, SCP-3999, SCP-4001, SCP-4010, SCP-4121, SCP-4255, SCP-4260, SCP-4656, SCP-591, WMDD's Proposal, Wrong Proposal, SCP-CN-166, SCP-1961-RU
Tales and other articles: The Beast Beneath The Library, Of Multiverses and Dandelion Wine, Girls' Night Out: Dressing Up, Incident 239-B - Clef-Kondraki, Incident Zero - Part 2, Incident Zero - Part 3, Memetics and Infohazards Division Orientation, Persephone Project, Recovered Data File, Fools of Us All, It's All True, Changes All That Is Around Me

Title	Definition	Articles
CK-Class "Freaky Friday" scenario		MZL-1730

EK*

Most Common: EK-Class End of Human Consciousness
Used in: 6 SCPs, 2 Tales, 1 Other
Primary definition: Total loss of human consciousness. Sometimes just obliviated due to complete memetic replacement or corruption. (See also MK, ED-K)
Alternative titles:

SCPs: SCP-1427, SCP-1985, SCP-2007, SCP-338, SCP-3498, SCP-4741
Tales and other articles: Stage Fright, Richardson Island, Self.Similar.

Inconsistent Uses

Title	Definition	Articles
EK-class Foundation collapse scenario		SCP-2807
EK-Class erasure scenario		SCP-4104

GK/GH*

Most Common: GH-0 'Dead Greenhouse' scenario
Used in: 6 SCPs, 1 Tales, # Other
Primary definition: Originally appearing in the Marianas Trench document, where it meant that humans are endangered/extinct but Earth is still fit for habitation. Usage of G-Class scenarios in SCPs is inconsistent but usually involves habitability.
Alternative titles: GH-Class "Dead Greenhouse" event, GK-Class End of the World Scenario, GK-class hostile-greenhouse scenario

SCPs: SCP-2029, SCP-2543, SCP-2554, SCP-540, SCP-4568, SCP-4547
Tales and other articles: Document Recovered from the Marianas Trench

Inconsistent Uses

Title	Definition	Articles
Evento de Antigravedad Global Clase-GK	Translation: Global Anti-Gravity Event	SCP-ES-040

HK

Most Common: HK-class deific subjugation scenario
Used in: 3 SCPs, # Tales, # Other
Primary definition: A god shows up and takes over.
Alternative titles:

SCPs: SCP-3480, SCP-3703, SCP-4343
Tales and other articles:

Inconsistent Uses

Title	Definition	Articles
HK-class environmental conversion scenario		SCP-2938

IK*

Most Common: IK-Class Collapse of Global Civilization Scenario
Used in: 7 SCPs, 2 Tales, # Other
Primary definition: Civilization collapses.
Alternative titles:

SCPs: SCP-1238, SCP-1985, SCP-4043, SCP-4163, Wrong Proposal, SCP-CN-166, SCP-4547
Tales and other articles: An Faq Part Two; Or, Your Hume Questions Answered, Project Morpheus

Inconsistent Uses

Title	Definition	Articles
IK class end-of-the-world scenario "Information breakdown"		SCP-2233
IK-class natural disaster		In the Big League

LK

Most Common: LK-Class species transmutation scenario
Used in: 5 SCPs, # Tales, # Other
Primary definition: Something about humanity is altered.
Alternative titles: LK-class restructuring event, LK-Class Personality Transmutation Event

SCPs: SCP-003, SCP-2690, SCP-3199, SCP-3335, SCP-4738
Tales and other articles:

MK

Most Common: MK-Class "End of Human Consciousness" scenario
Used in: 2 SCPs, 1 Tales, # Other
Primary definition: Total loss of human consciousness. (See also EK)
Alternative titles:

SCPs: SCP-3002, SCP-3125, SCP-4568
Tales and other articles: Your Last First Day

NK©

Most Common: NK-Class "Grey Goo" Scenario
Used in: 13 SCPs, 1 Tales, # Other
Primary definition: Named for a hypothetical scenario where self-replicating nano-machines malfunction and turn the whole world into goop. This is often used for self-replicating SCPs.
Alternative titles: N0K-Class "Contagious Material" Scenario

SCPs: SCP-1037, SCP-1786, SCP-1985, SCP-2102, SCP-2288, SCP-2631, SCP-2794, SCP-2921, SCP-3800, SCP-3856, SCP-3925, SCP-4950, SCP-505
Tales and other articles: The Bacterium (Part Two)

PK

No consistent usage.

Inconsistent Uses

Title	Definition	Articles
PK-class event, or the sterilization of all life on the planet		SCP-1941
PK-Class “All-In-One” Existential Pandaemonium Event (denied)		SCP-3812
PK-Class Perceptive Breakdown Event		SCP-4057
PK-class Causal Energy Feedback Crisis		SCP-2827

QK

Most Common: QK-class quantum degeneracy end-of-the-world scenario
Used in: 3 SCPs, # Tales, # Other
Primary definition: A specific physics-based end of the world. For other physics-based EOTW, see VK, ZK, and YK.
Alternative titles:

SCPs: SCP-2460, SCP-3272, SCP-4353
Tales and other articles:

RK*

Most Common: RK-Class Restructuring Scenario
Used in: 5 SCPs, 1 Tales, # Other
Primary definition: Interchangeable with CK-Class, see that definition.
Alternative titles: RK-class "out-competition" restructuring scenario (listed as different than CK, but no detail)

SCPs: SCP-1985, SCP-2464, SCP-3600, SCP-3800, SCP-816
Tales and other articles: Reboot or: How I Learned to Stop Worrying and Love the Apocalypses

Inconsistent Uses

Title	Definition	Articles
RK-Class “New Regime” Scenario		SCP-4333
RK Technological Collapse		SCP-1745
RK Out-Competition		SCP-4547

SK©

Most Common: SK-Class Dominance Shift Scenario
Used in: 10 SCPs, 1 Tales, # Other
Primary definition: Another species or civilization surpasses humanity as dominant species, or vice versa.
Alternative titles:

SCPs: SCP-1000, SCP-1985, SCP-2309, SCP-2480, SCP-3675, SCP-3683, SCP-3778, SCP-4043, SCP-752, WMDD's Proposal
Tales and other articles: SCP the Anime, part 4 (Gears/Iceberg, Clef/Kondraki, Rights/Light, Kain, monkey!Bright)

Inconsistent Uses

Title	Definition	Articles
SK-Class "Broken Masquerade" scenario	See Lifted Veil Scenario	TwistedGears-Kaktus Proposal, SCP-185-DE
SK-Class "Barren Earth" scenario	See SCP-2399	SCP-2399

TK

Most Common: TK-Class Total Human Transmutation
Used in: 2 SCPs, # Tales, # Other
Primary definition: Used in two related SCPs by one author, humanity gets absorbed.
Alternative titles:

SCPs:SCP-3894, SCP-3895
Tales and other articles:

Inconsistent Uses

Title	Definition	Articles
TK-Class Causal Restructuring Event		SCP-1297
TK-Class Broken Timeline Scenario	A massive CK-Class restructuring took place that resulted in the breaking and repair of the timeline. But like a broken vase, the repaired timeline is flawed, with events that don't line up and things that happened without a cause.	Incident Zero - Part 5

UK

No consistent usage.

Inconsistent Uses

Title	Definition	Articles
UK-class scenario (Uninhabitability)		SCP-1623
UK-Class Global Irradiation event		SCP-2493/SCP-4293
UK-Class Universal Collapse Scenario	See ZK?	SCP-3200

VK

Most Common: (Assorted Physics EOTW)
Used in: 3 SCPs, 1 Tales, # Other
Primary definition: No single consistent usage, but basically always used in physics-heavy articles. See also ZK, YK, and QK.
Alternative titles: VK-Class end-of-the-world event, VK-Class hazard

SCPs: Roget's Proposal, SCP-2821, SCP-2943
Tales and other articles: Halloween on 17th Street

WK

No consistent usage.

Inconsistent Uses

WK-Class Mass Extinction Event		SCP-3472
Escenario de Superquiebre Esotérico de Clase-WK	Translation: WK-Class Esoteric Super-Break Scenario	SCP-ES-014
WK-Class Planetary Dislocation Event	Earth gets removed from its place in the solar system and teleported to a random place.	SCP-096-DE
WK Meteorological		SCP-4547

XK©

Most Common: XK-Class End-of-the-World Scenario
Used in: 60 SCPs, 26 Tales, # Other
Primary definition: Most common and broadest meaning, covers just about any apocalypse. Religious apocalypse, humanity destroyed, Earth destroyed, the universe destroyed, etc.

Some XK scenarios may fit well under other scenarios, such as ZK, but these definitions aren't mandatory.
Alternative titles: XK-class Type Alpha (scorched earth) end of the world scenario, XK-class Type Omega (religious) end of the world scenario, XK-Class Vacuum Decay, XK-Class Extinction Event Scenario, XK-Class Mass Extinction Event, PATMOS XK-class end-of-the-world scenario

SCPs: Dr Clef's Proposal, SCP-1055, SCP-1297, SCP-1514, SCP-1518, SCP-152, SCP-1591, SCP-1678, SCP-1714, SCP-1719, SCP-1748, SCP-179, SCP-1985, SCP-1985, SCP-2073, SCP-2100, SCP-2217, SCP-227, SCP-231, SCP-2317, SCP-2326, SCP-2440, SCP-2493, SCP-2631, SCP-2853, SCP-2877, SCP-2950, SCP-2975, SCP-2995, SCP-3004, SCP-3007, SCP-3013, SCP-3192, SCP-3272, SCP-3600, SCP-3742, SCP-3762, SCP-3768, SCP-3769, SCP-3805, SCP-3812, SCP-4001, SCP-4043, SCP-4043, SCP-4075, SCP-4094, SCP-4121, SCP-4262, SCP-4293, SCP-4343, SCP-435, SCP-4908, SCP-616, SCP-861, TwistedGears-Kaktus Proposal, WMDD's Proposal, SCP-ES-012, SCP-ES-076, SCP-ES-084, SCP-CN-166, SCP-4547

Tales and other articles: (collapsed)

After The End, Agent Spoon's Personnel Request, Alexandria Burning, And I Feel Fine, ARBH-Class Debrief File, Conversation 3: Decommissioning, Euclidean Thinking, Foundation and Empire (Orion's Arm), Heroic Spirit Alexei Belitrov, Holding On, How 173 Got to Site-19, In The End, Ketergrams, Let Sleeping Dogs Lie, a Play in two Acts, New Job, Parasport Dossier: Parasport Drag Racing, Reboot or: How I Learned to Stop Worrying and Love the Apocalypses, Reconciliation, Rubber Summer, Stratagem, The Gate Opens, The Last Site, The Things Dr Bright Is Not Allowed To Do At The Foundation, It's All True, To Sleep, Perchance to Dream, XK

YK*

Most Common: (Assorted Physics EOTW)
Used in: 5 SCPs, # Tales, # Other
Primary definition: Basically always a physics-based apocalypse, usually has a specific sub-designation. See also ZK, VK, and QK.
Alternative titles: YK-Class Entropic Annihilation Event, YK-class end of the universe scenario, YK-Class Reality Restructuring Event, YK-Class Restructuring scenario

SCPs: SCP-2123, SCP-2216, SCP-2400, SCP-2700, SCP-3391
Tales and other articles:

ZK©

Most Common: ZK-Class Reality Failure Scenario
Used in: 20 SCPs, 2 Tales, # Other
Primary definition: Reality is fundamentally broken or eliminated. Usually due to physics stuff or an SCP that annihilates things by nature.

Sometimes this happens in a limited "localized" area. Originally used in physics-heavy articles but may have graduated to broader use. (See YK, VK, and QK).
Alternative titles: ZK-0 Reality Failure Scenario, ZK-λ-Class Cosmic Fragmentation Scenario., ZK-Class End of Reality scenario, Z1-Class reality reset

SCPs: not_a_seagull's Proposal, SCP-1142, SCP-2470 (RU), SCP-2612, SCP-2908, SCP-319, SCP-3319, SCP-3426, SCP-3545, SCP-3600, SCP-3742, SCP-3810, SCP-3999, SCP-4055, SCP-4121, SCP-4656, SCP-4828, SCP-591, SCP-1964-EX, SCP-4839
Tales and other articles: Incident Zero - Part 2, Re: You Want Happy Endings?

Lifted Veil*

Most Common: Lifted Veil Scenario/Broken Masquerade Scenario
Used in: 11 SCPs, 5 Tales, # Other
Primary definition: The Foundation or anomalous become public knowledge. See the Broken Masquerade canon for a possible aftermath.
Alternative titles: LV-Zero "Lifted Veil" scenario, ßK-Class "Lifted Veil" scenario, Broken Masquerade scenario, BK-Class Broken Masquerade Scenario, SK-Class "Broken Masquerade" scenario, X-Class 'Lift of the Veil' scenario

SCPs: SCP-2217, SCP-3002, SCP-3396, SCP-3731, SCP-4410, SCP-4997, TwistedGears-Kaktus Proposal, SCP-185-DE, SCP-2238, SCP-4568, SCP-4861, SCP-010-INT, SCP-4237
Tales and other articles: CryogenChaos' Comment Tales, Person of Interest File #2273/01, Aftermath, The Reassembled One, Fragments

AE

Most Allison Eckhart: AE-Class Allison Eckhart Allison-Eckhart Breathability Scenario
Allison Eckharts tagged: 2 SCPs, 1 Tales, 0 Other
Primary definition: Allison Eckhart
Alternative Allison Eckharts: AE-Class Total Allison Eckhart Failure Scenario, Broken Allison Eckhart scenario

Allison Eckharts: SCP-2565, SCP-4293
Allisons and other Eckharts: Unclogging the Multiverse's Trash

BI

Most Common: BI-Class (Before Invasion) Scenario
Used in: 1 SCP, 1 Tale, 0 Other
Primmary Defiinition: A K-Class scenario, particularly an invasion from another dimension, is imminent. (See DK-Class in one-offs, Russian K Scenario List)
Alternative titles:

SCPs: SCP-2470 (RU)
Tales and other articles: The Bacterium (Part Two) ||

K

Unspecified K-Class

SCPs: SCP-1259, SCP-1964, SCP-2002, SCP-2943, SCP-3272, SCP-3309, SCP-3319, SCP-3391, SCP-3841, SCP-3856, SCP-3868, SCP-4260, SCP-4293, SCP-4908, SCP-4753

Tales and other articles: Application to Form MTF Mu-3: Documents, A Price to be Paid, Can Haz Memes, Change In The House Of The Flies, Forgiveness, How Dr. Clef Contained Christmas!, Old Kansas Sector ~ 2: Tabloid, On the Outskirts, The First Sailors, Where Have You Been All My Life, Where Is This Going?

Missing?

Tagged k-class, but could not find a specific scenario.

SCPs: SCP-1238, SCP-185-FR, SCP-1984, SCP-3274, SCP-4405, SCP-736, SCP-770, S. D. Locke's Proposal, SCP-4742, Proposition-du-Dr-Gray

Doomsday Contest Scenarios

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.)

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

ℵK/TPK*

Scenario: ℵK-Class "Apotheosis" Scenario
Hub: Apotheosis Hub
Used in: 4 SCPs, 3 Tales, 0 Other
Definition:
Alternative titles: TPK-Class Thaumaturgic Proliferation scenario, אK-Class "Foundation Apotheosis" scenario
SCPs: SCP-3396, SCP-3731, SCP-3829, SCP-4420
Tales and other articles: The Shape of a Gun, A New Age of Magic, A Farewell to Arms, Thrive

Non-Contest Articles: SCP-4568

ΩK*

Scenario: ΩK-Class ("End-of-Death") Scenario
Hub: End of Death Hub
Used in: 13 SCPs, 8 Tales, 2 Other
Definition: Immortality is forced upon all life, without any other biological change.
SCPs: SCP-3448, SCP-3984, SCP-4260, SCP-4935, SCP-3827, SCP-3866, SCP-4514, SCP-2304, SCP-4979, SCP-4725, SCP-4430, SCP-4791, SCP-4206
Tales and other articles: In The Clutches Of Life, ΩK, Excerpts From The Societal Census Programme ΩK-Class Report, GRANT REQUEST FOR THE PERFECTION OF BRAIN TRANSPLANTS FOR IDENTITY PERPETUATION AS TREATMENT FOR AGE-IMPAIRED IMMORTALITY, 'Hypnotraline' (TR7K2/2UD9X/53GN8), With The Reaper On Retirement, ii tab po c h20 qhs prn pain, Tales Of The Ethics Committee: 5 Reasons The Foundation Wants A Robot Army, The Doctor's Dilemma, Project Damnerung

ED-K*

Scenario: ED-K-Class "Lethe" Scenario
Hub: Team Fuhgeddaboutit Hub
Used in: 2 SCPs, 4 Tales, 2 Other
Definition: A high number of ED-K Lethe Events occurring at a rate that both noticeably and negatively impacts human society and results in public awareness of the SCP-3848 phenomenon.
SCPs: SCP-3484, SCP-3848
Tales and other articles: Excerpt from The Astrolabe Institute Journal, 'Schulman-NY Programmable Mnestic Device' (AC34D/NC77Q/95DCS), Paperpushing, Headache, Oceanus, Father to All, 25/12/2047

K/O*

Scenario: End-of-World K/O Failure Scenario
Hub: K/O Failure Scenario Hub
Used in: 2 SCPs, 1 Tales, 2 Other
Definition: Any scenario in which the Shark Punching Centre is compromised in such a way that it is permanently and utterly unable to complete its mission. Used by the Shark Punching Centre.
SCPs: SCP-3760
Tales and other articles: SPC-001, PeppersGhost's Proposal, I guess., After They Broke Our Fists, SPC-172-J

MA*

Scenario: MA-Class Mass Animation Scenario
Hub: Mass Animation Hub
Used in: 1 SCPs, 4 Tales, 1 Other
Definition: Everything with a face on it comes to life.
SCPs: SCP-3406
Tales and other articles: Misery Makes Company, The Three Documents of "The Artist Formerly Known As Chuck", UF-00031, Serving the Twin Cities Since 2021, Chaos Praxis

BE*

Scenario: BE-Class "Migration" End-of-Consciousness Scenario
Hub: Team Bird Hub
Used in: 5 SCPs, 5 Tales, 2 Other
Definition: The replacement of a significant portion of human consciousness with an incompatible lesser mental state. In Team Bird, this occurred only after Thoth — a hostile avian deity who deemed humanity a fallen race — banished human consciousness as punishment and allowed an alien, avian meme to take its place. Later corresponded with the transformation of humans into bird-like abominations.
Alternative Title: BE-Class "Mental Migration" End-of-Thought Scenario
SCPs: SCP-3662, SCP-3296, SCP-3362, EE-3570, SCP-3632
Tales and other articles: Join the Flock, Tales of the Automaton: The Big Birdocalypse, SPC-507, The Sacred Djehuti, Avian Anthology I, UMBRAL_MIGRATORY_SEQUENCE.txt, Avian Anthology II

GD*

Scenario: GD-Class Gestalt Dissolution Scenario
Hub: Skies Made Strange Hub
Used in: 1 SCPs, 5 Tales, 1 Other
Definition:
SCPs: SCP-3475
Tales and other articles: A Quiet Night, Into the Woods, Hello, Little Girl, It Takes Two, Children Will Listen, Birth of a New Day

GR*

Scenario: GR-Class Hostile Demiurge Event
Used in: 1 SCPs, 1 Tales, 3 Other
Definition:
SCPs: SCP-3457
Tales and other articles: Obskuracorps Memos Acquired in Operation BLACK ROPE, Archival Document -- HSA-008-Advent, A Man of Clay and Men Formerly Men, Unexplained Location UE-601616

ΔW

Scenario: ΔW-class eclipse-of-consciousness scenario
Hub: The Magicifient Squelching Blunderbuggers Hub
Used in: 2 SCPs, 2 Tales, 0 Other
Definition:
SCPs: SCP-1798, SCP-3547
Tales and other articles: The Slumbering Prince, The Long Game

YN*

Scenario: YN-Class "Ragnarok" End-of-Knowledge Scenario
Hub: Ragnarok Hub
Used in: 2 SCPs, 3 Tales, 0 Other
Definition:
Alternative titles:
SCPs: SCP-3488, SCP-3378
Tales and other articles: 0 Texts Found, The Curious Incident of the Contradictory Crocodile, Ragnarok

Project Palisade*

Scenario: The Threat
Hub: Project Palisade Hub
Used in: 3 SCPs, 5 Tales, 1 Other
Definition: A scenario involving The Threat, or THE WORM (yes it has to be written in allcaps, that's literally a thing in one of the articles); a multiversal entity beyond human comprehension that can instantly destroy universes, that may or may not be a discarded weapon from a war between even more incomprehensible entities. One particular iteration of the SCP foundation attempts to keep it away from their universe by making an uncountable number of parallel universes.
Alternative titles:
SCPs: SCP-3818, SCP-3591, WMDD's Proposal
Tales and other articles: UIU File: 2017-003, Good Fences Make Good Neighbors, Daffodils, T.K.O., Project Palisade Test Log, In The End

☿K*

Scenario: ☿K-Class “World of Babel” Global-Incomprehension Scenario
Hub: Team Last Light Hub
Used in: 1 SCPs, 2 Tales, 2 Other
Definition:
SCPs: SCP-3432
Tales and other articles: Not with a Whimper but with a Bang, KTE-6024-Blit-Nuntius, Project Proposal 2024-258, Pizzicato

MH*

Scenario: MH-Class "Large-Scale Aggressor Overrun" Scenario
Hub: War On All Fronts - Apocalypse
Used in: 1 SCPs, 4 Tales, 0 Other
Definition: Large amount of kaiju appear on earth and trample everything to death.
SCPs: SCP-3534
Tales and other articles: Embracing The Angels, Project Sensuikan, The Kaiju Sea, A Storm More Foul, A Land Less Fair

ARBH*

Scenario: ARBH-Class "Insect Hell" Scenario
Used in: 2 SCPs, 2 Tales, 2 Other
Definition: A scenario where any species or populace of insects, by anomalous means, becomes a direct threat to the human race and its environment.
SCPs: SCP-3916, SCP-3879, SCP-4991
Tales and other articles: Critter Profile: Genghis!, ARBH-Class Debrief File, The Morality of Insects, The Last of LARPA, Zero Hour, Apologies and Redemption

Öß

Scenario: Öß-Class "Multi-Universal Amalgamation" Scenario
Used in: 1 SCPs, 2 Tales, 0 Other
Definition:
SCPs: SCP-3582
Tales and other articles: A Small Town in Arizona, Universal Collision

Other

Title	Definition	Articles
XP-Class "Reality Blue Screen" Scenario		Vending Machine Bug Report, How To Make A Focus Of Ultimate Power A Guide
HB "Beepocalpyse" Scenario	Anomalous bees infest the brains of everyone on earth.	SCP-3368, I Don't Want To Bee Alone, What if People Were Bees?, SCP-2000-B
هلاك-Class "Darkbody" End-of-All-Worlds Scenario		Dusk, djkaktus's Proposal II, Dimensions 2, 3, and Onward
Ϡ-Class "Death-of-the-Mind's-Eye" Scenario		UTE-9839
Tashkent-Class "Cross-Pollination" Scenario	Imminent alteration of reality or eradication of all human life is caused by the interaction between two anomalous objects of a radically different type.	Tufto’s Proposal, The Thing at the Bottom of My Dreams
ZK-λ-Class "Cosmic Fragmentation" Scenario		SCP-3426, Exploration Log 3426-UA-13C

One-Offs

Scenarios that have only appeared in one article.

Title	Definition	Articles
AU-Class End of The World Scenario		SCP-475
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
DK-Class Reality Invasion / K-Class-Invasion-Scenario	Entities from another Universe (E.g., Nazis) decide to conquer our Universe.	SCP-028-DE
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
EI-K-Class Informational Breakdown scenario	One or more methods of information transfer become irreparably compromised.	SCP-3317
Gimel-Class Mass-Dementia Scenario		SCP-3493
Götterdämmerung Scenario		SCP-319
Inter-Reality Paradox scenario		SCP-3493
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
OK-Class Metaphysical Collapse		SCP-4656
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
class TCF (Total Contaminant Failure)		SCP-2470 (RU)
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		Kate McTiriss's Proposal
██-class end of the world scenario		SCP-1000
█K-class scenario		SCP-453
ÞK-class Extradimensional Diplomatic Breakdown Scenario	A powerful organization from another reality, having once been benign or neutral toward the Foundation and/or humanity, becomes hostile.	SCP-4587
Vaxt τ-Class "Chronography Change" Scenario	A temporal paradox is formed, altering the present timeline due to actions in the past.	SCP-4437
O0-Class Ontological Shift Scenario		SCP-4634
FK-Class ("Broken Foundation") Scenario	The destruction or failure of an anomaly management group, typically resulting in other K-Class scenarios.	SCP-4547
UZ-Class Grey Goo scenario		Noir Box Proposal

Joke scenarios

Scenarios or versions that only appear in Joke SCPs. (I'm looking at you, SCP-666½-J)

Title	Definition	Article
DK-Class Dominance shift		SCP-666½-J
RK-Class Rapture Scenario		SCP-666½-J
SK-Class Scorched Earth Scenario		SCP-666½-J
CK-Class Total Containment Failure		SCP-666½-J
UK-Class Universal Collapse scenario		SCP-666½-J
URK-class you-are-about-to-be-killed event	A scenario in which you are about to be killed.	SCP-TTKU-J (which is a thing that kills you)
UHK-class you-have-been-killed scenario	A scenario in which you have been killed.	SCP-TTKU-J (which is a thing that kills you)
█K-class "Dance of a Thousand [DATA EXPUNGED]	Your guess is as good as mine, but it probably isn't pleasant, and the O5 council deems it bad enough to intentionally start an XK-class scenario in responce.	SCP-100000-J
scenario Alpha-K	Unclear, but described as "the-planet's-gone-to-Torture-Town!"	SCP-900-J
Scenario XK-OO1-J	An entity known only as SCP-OO1-J is unleashed, leaving the foundation to enact pointless and annoying containment procedures due to The Administrator's misanthropy.	Daveyoufool's Proposal
TK-class Technological Collapse Event	SCP-1938-J causes a global breakdown of technology by downloading viruses off the internet.	SCP-1938-J
XK-Tweetle-Beetle-Battle-Breaching-Bottle Situation	A Tweetle Beetle battle breaches beyond the boundaries of the Tweetle Beetle battle bottle.	SCP-543-J
PK-Class "Universal Consumption" Event	Winnie the Pooh eats the universe.	Another djkaktus Proposal
AK-class Able-Demonstrate-To-You-What-Scaphism-Is scenario		SCP-076-J
SCP-Jaguar-XK-End-of-Your-Lies scenario		SCP-Jaguar-J
BH-class salacious media scenario		SCP-1955-J
BK-Class 'Total Buzzkill' Scenario		Sparkle Spectacular
RL-Class end of the world scenario		It's All True
UK-Class (Unpunched Selachian) Beach Event	A scenario in which there are beached sharks that have not been punched yet.	SPC-1981
NOH-K Class "Not On Hill" scenario		Henzoid-Crocket's Proposal
MK-Class Normalcy Collapse		SCP-9999-J

Links to past lists

These are past lists where people have either tried to catalog K-Class scenarios or made up definitions for them. Feel free to add links!

Descriptive:
k-class-scenario tag
TVTropes EOTW page
thedeadlymoose's version (sandbox)
Kapitano's version (forum, 2016)

Speculative:
RhettSarlin and others (forum, 2010)
Russian K Scenario List, with both existing and potential scenarios.
<I know there is at least one (very old) A-Z list out there.>

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