Unofficial K-class Scenarios List
Hey everybody this is Eastside Steve this list is unofficial in every way.
Its basically non-cannon, and in SCP, cannon is what you make of it.
Basically its a head-cannon.
um if you are interested and if you're an author who writes for scp or want to write
for scp sometime, check out the read me link in the description and it offers a lot of
advice for people who want to write for scps and a bunch of author notes and general advice
so I am kind of skipping over that so I am just going to get right into the k-class list.
A-Level Scenarios (Generally accepted site-wide.
Appears in multiple SCP articles/Foundation tales or one well-received, well-known "permanent
resident" article or tale.)
AK-class end-of-the-world scenario Definition: End of the world via restructuring
of subjective reality - that is, the perceptions and/or thought processes of the human race.
Simply put: "everyone goes crazy", by one fashion or another.
Moose's Notes: Multiple references using similar definitions have appeared independently of
each other in various works.
This can also be thought of as a "restructuring" scenario; but it would typically be termed
as an "end of the world" scenario because effectively, for humans, the world has ended,
just as thoroughly as if civilization got all blowed up.
Appearances: Change
Scenario is first referenced and established as a scenario involving reality shifts, related
to BK-class undefined and CK-class restructuring.
SCP-571 Scenario is a the permanent alteration of
behavior in all or the vast majority of the human race, caused by a memetic pattern with
a piggybacking anomalous effect that forces the user to permanently fixate on spreading
it.
SCP-1101 Scenario is a perpetual argument encompassing
all or the vast majority of the human race, caused by a mind-altering device with an exponential
effect.
CK-class restructuring scenario Definition: Restructuring of reality.
May mean a significant change in history (rewriting the present to match), or a change in the
way physical laws work, or in the way the universe works, or a major rewriting of reality
encompassing some or all of these.
Moose's Notes: The original restructuring scenario.
May have been created by an ex-site member (and called "CK-class reconfiguration") but
as their work no longer exists, their usage of it is irrelevant.
The only-used-one "CK-class end of the world scenario" may be a subset of this scenario
(see below).
Appearances: SCP-140
Scenario is retroactive restructuring of modern society based on alterations to timeline.
Of Multiverses and Dandelion Wine Scenario in which the multiverse is collapsing,
universes merging together.
Incident 239-B - Clef-Kondraki (SCP-239) Scenario is a reality bender rewriting reality
as we know it.
SCP-1237 A wide variety of wide-scale non-apocalyptic
reality shifts.
Change Scenario referenced along with AK-class and
BK-class scenarios as one of three scenarios involving reality shifts.
Recovered Data File Scenario involves multiple CK-class events,
some deliberately initialized by the Foundation, apparently attempting to repair or control
an ongoing restructuring scenario.
GH-class "dead greenhouse" scenario Definition: Life as we know it is 80% or more
dead, but the planet can still be fixed, more or less, and can still support life.
Moose's Notes: Also referred to a "DG-class scenario" unofficially (by author Dr. Gears
in discussion).
Appearances: Document Recovered From The Marianas Trench
Scenario is near-total SCP containment breach, causing widespread destruction and chaos in
which most of humanity dies, and the Foundation must rebuild the world to an approximation
of what it once was.
Referred to as "GH-0".
NK-class end-of-the-world scenario Definition: End of the world caused by self-replicating
material.
Moose's Notes: Also referred to as the "grey goo" scenario.
Once defined as a scenario characterized by an explosive event with effects on a geological
scale; this definition can be considered defunct, as the current definition has been widely
accepted (and the earlier definition seems excessively specific).
Appearances: SCP-505
Scenario is massive-scale environmental contamination caused by self-replicating ink.
RK-class restructuring scenario Definition: Out-competition of standard Earth
species by non-standard life-forms.
Moose's Notes: Definition taken from SCP-816 and thus may be excessively/inaccurately specific.
Alternate suggested definition: World is changed, but humanity, history, and rules of reality
are the same.
Appearances: SCP-816
SK-class dominance shift scenario Definition: Changing of the planet's dominant
species.
Moose's Notes: In the modern day, indicates a shift to dominance by another life form,
or humans of alternate form and/or culture.
Appearances: SCP-752
Scenario is competition between modern-day humans and genetically/socially re-engineered
humans, projected to result in dominance shift.
SCP-1000 Scenario is shift in which humanity becomes
the dominant species of Earth by driving another species to near-extinction and destroying
their civilization semi-permanently.
XK-class end-of-the-world scenario Definition: "Salted earth" end of the world
scenario; in other words, destruction of the world as we know it with little possibility
of immediate rebuilding.
May include (but is not defined by) threat of species extinction.
Moose's Notes: The original end-of-the-world scenario.
Formerly meant a religious apocalypse in line with some variant of Abrahamic religious beliefs
(usually as a direct result of a major religious event or artifact); expanded further to the
above definition.
This term is also used as a shorthand or slang term for all apocalyptic scenarios.
Appearances: Dr. Clef's Proposal for SCP-001
Scenario is a Biblical apocalypse of some variant.
SCP-152 Includes many XK-class scenarios that involve
the extinction of humanity.
Specifies that apocalyptic events that involve the extinction of humanity are not all classified
as XK-class scenarios.
Revised Entry to SCP-173 Scenario involves alternate-universe version
of SCP-173 gaining the ability to multiply with a hive mind, wiping out most of the human
population of North America, South America, and the United Kingdom, followed by saturation
nuclear bombing.
SCP-227 Two example XK-class scenarios are given:
wandering brown dwarf (the so-called “Nemesis hypothesis”) or a gamma ray burst.
Other apocalyptic cosmic events that are classified as XK-class scenarios are implied.
SCP-231 Scenario involves a Satanic cult-induced pregnancy
(serving as a "seventh seal") being ended or carried to term, resulting in a supernatural/religious
apocalypse.
SCP-435 Scenario involves SCP-435-2, the 'shadow'
of an extra-dimensional entity, causing massive widespread destruction on a nuclear detonation
scale at minimum… to start.
Prevented only by keeping SCP-435-1 under bright light.
A last-resort preventative is Contingency 435-XK-Alpha.
SCP-616 (Fictional) procedure involves destruction
of (supposedly) Abrahamic-religion-based SCP in event of any XK-Class end-of-the-world
scenario.
SCP-701 Specifically not an XK-Class scenario (only
kills hundreds of people a year).
SCP-861 Variety of scenarios based on Judeo-Christian
religious beliefs.
Refers to XK-400 and XK-423 through XK-436.
XK-400a involves YHVH; XK-440c through XK-440v involve either the Seven Seals or entities
associated with the Seven Seals; SCP-861 is preliminarily designated XK-440x; XK-423 involves
Leviathan.
SCP-923 Scenario involves permanent alteration of
landscape to create insanity in addition to severe spatial and temporal disturbances and
various other worse (classified) effects, including materialization of something classified.
SCP-1023 Scenario involves the detonation of a record
number of nuclear detonations within a short period of time.
SCP-1200 References an apocalyptic scenario that can
be prevented by "containing and manipulating the cognitive patterns of SCP-███-█",
a human child (possibly SCP-231-7).
SCP-1237 Used to refer to a variety of possible apocalyptic
scenarios caused by rewriting parts of reality via dreams (as distinct from the CK-class
scenarios considered more likely to result).
SCP-1591 Scenario involves a device that could theoretically
dissolve the entire Earth, and certainly the organisms on it.
Stratagem (SCP-008) Release of SCP-008 (zombie virus) said to
likely result in an XK-class or XC-class scenario.
To Sleep, Perchance to Dream Scenario involves using Protocol XK-0272/A
as a reaction to a mass (potentially species-wide) deadly infection; protocol requires destruction
of all major worldwide population centers.
Shorthand & Slang References: (May not actually be technically classified as XK events/scenarios)
SCP-096 Scenario involves near-unkillable creature
breaching containment and killing the majority of the human species; likely slang.
SCP-108 Used to refer to all apocalyptic scenarios.
SCP-523 Used to refer to all apocalyptic scenarios.
SCP-630 Contamination of water supply which would
turn warm-blooded life into black non-reflective blind heat-seeking zombies is referred to
in a researcher note as a "kind" of "XK event"; likely slang.
ZK-class reality failure scenario Definition: Reality failure; may or may not
be only one of many realities.
May include end of all reality.
Moose's Notes: Proposed multiple times before finally being used, always in the same sense.
Appearances: S. Andrew Swann's Proposal for SCP-001
Scenario is the possible failure of the Foundation's reality.
B-Level Scenarios (Used in a less well-known SCP article or
Foundation tale, or is vaguely defined but used in multiple pieces.)
BI-class biological invasion scenario Definition: Invasion of Earth by extraterrestrial
life-forms.
Moose's Notes: Implies some kind of distinction between extraterrestrial biological and non-biological
invasion.
Not widely accepted, but potentially usable.
Appearances: The Bacterium, Part One, Part Two, Finale
CK-class end-of-the-world scenario Definition: End of the world via wide-scale
(or total) restructuring of the physical mass of the world.
Moose's Notes: Seems to be a specific subset of the CK-class restructuring scenarios.
Appearances: SCP-1053
SCP-1012 EK-class undefined scenario
Moose's Notes: Does not end human life.
Possibly destroys society.
Possibly destroys most or all of human consciousness.
Appearances: SCP-338
“a looped recording of survival instructions, rendezvous locations, and status updates about
"The Great War", and seems to describe an EK-class scenario caused by the release of
SCP-███.
The contents are changed and updated sporadically, ranging from twice daily to once every 3 weeks.”
SCP-1427 Involves extinguishment of all human consciousness
within approximately 215 days.
IK-class collapse-of-global-civilization scenario Definition: Collapse of global civilization
of a fashion that does not fall under another scenario.
Moose's Notes: Scenario did not originally imply any SCP containment breach, just any
truly massive natural disaster.
Later expanded to be defined as global civilization collapse (often caused by natural disasters
on a massive scale).
Appearances: SCP-1238
Scenario is a partial collapse of continental plates that would destroy major population
centers.
In the Big League Scenario is an asteroid strike with estimated
casualties of approximately three billion over ten years.
C-Level Scenarios (Used in an SCP article or Foundation tale,
but undefined.)
BK-class undefined scenario Moose's Notes: Explicitly related to AK-class
undefined and CK-class restructuring.
This, like the others, is a scenario involving reality shifts.
Likely a restructuring scenario.
Appearances: Change
XC-class undefined scenario Moose's Notes: Probably a redundant class
at this point; used as a throwaway and not necessarily very usable.
Alternatively, a C-class scenario could reflect a 'partial' K-class scenario; for instance,
an XC-class scenario could be the destruction of a specific sub-section of humanity, say,
with genes that made them susceptible to a certain anomalous thing (while the rest of
humanity survives).
Appearances: Stratagem (SCP-008)
Results from an SCP-008 outbreak; XK-class scenario suggested as similar likely alternate
result.
D-Level Scenarios (Unused, but proposed or referenced multiple
times in discussion.
These definitions have a tendency to change.)
YK-class vacuum decay scenario Definition: Vacuum metastability event, wiping
out all life and reality.
Moose's Notes: Proposed by "The_Raven", used only in a deleted article.
Seems a bit overly specific.