CASE NIGHTMARE RED is the Laundry's code name for an "end-of-the-world" scenario involving invasion of Earth by a hostile alien force. Provisions include calling up the regular military, providing necessary disclosures and armaments, cover stories for maintaining operational secrecy, and provisions for problem disclosure in the event compartmentalization is no longer an option.

First activated during the Leeds Incident, in which the Host of Air and Darkness invaded Earth from a parallel reality. (The Nightmare Stacks)

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