Primary Containment Classes:
Safe:
Easily and safely contained.
Example: SCP-500 (panacea pills).
Euclid:
Requires more resources or is unpredictable; not always reliably contained.
Example: SCP-173 (the Sculpture).
Keter:
Extremely difficult to contain; procedures are complex or technology is lacking.
Example: SCP-682 (hard-to-destroy reptile).
Secondary/Other Classes:
Neutralized:
No longer anomalous or destroyed.
Example: SCP-1730 (formerly anomalous site).
Explained:
Anomaly is fully understood and explained by science.
Example: SCP-4000 (reclassified after explanation).
Pending:
Not yet assigned a class; under review.
Esoteric/Special Classes (Uncommon or Special Purpose):
Thaumiel:
Used by the Foundation to contain or counter other SCPs.
Example: SCP-2000 (reality-reset machine).
Apollyon:
Cannot be contained; will inevitably cause or is causing a world-ending event.
Example: SCP-3999 (reality-breaking entity).
Archon:
Could be contained, but doing so would cause more harm than good.
Example: SCP-001 (some proposals).
Other Classification Systems:
Disruption Class:
How much the SCP disrupts normalcy (e.g., Vlam, Keneq, Ekhi).
Risk Class:
How dangerous the SCP is (e.g., Notice, Caution, Danger).
These classes help the SCP Foundation decide how to contain, prioritize, and allocate resources for each anomaly
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Common SCP Scenario Types and Examples
XK-class end-of-the-world scenario:
Complete destruction of human civilization or the planet.
Example: An unstoppable SCP causes global extinction.
CK-class restructuring scenario:
Reality or history is rewritten or drastically altered.
Example: A reality bender changes the laws of physics or timeline.
GH-class "dead greenhouse" scenario:
Most life on Earth dies, but the planet can still support recovery.
Example: Massive containment breach leaves only small pockets of survivors.
NK-class end-of-the-world scenario:
Global destruction caused by self-replicating material ("grey goo").
Example: Nanomachines or anomalous ink consume the world.
RK-class restructuring scenario:
Non-human life forms outcompete and replace standard Earth species.
Example: Anomalous organisms take over the biosphere.
AK-class madness scenario:
Humanity suffers a mass mental breakdown or loses the ability to function normally.
Example: A memetic SCP spreads uncontrollably, causing insanity.
IK-class collapse-of-global-civilization scenario:
Collapse of civilization due to disaster, but not necessarily extinction.
Example: Asteroid strike destroys infrastructure, billions die, but some survive.
BI-class biological invasion scenario:
Earth is invaded by extraterrestrial or anomalous biological entities.
Example: Alien life forms begin colonizing Earth.
ZK-class reality failure scenario:
Total destruction of reality itself.
Example: Reality is erased or ceases to function.
These scenario types help the SCP Foundation plan for different catastrophic or reality-altering events.