An agent (name classified) failed to report to duty at the assigned time.He was instead found in his quarters, asleep. The agent had been asleep for roughly eighteen hours and all subsequent attempts to wake him were unsuccessful, eventually leading to him being transported to the medical bay.
After over 40 hours of sleep, the agent awoke in a highly agitated state. He was reported to have ran through the facility yelling loudly about "the end of the world." Even after being heavily sedated, all of his bodily functions remained in a dangerously accelerated state: increased heart rate, high blood pressure, etc.
He described a man matching the regular appearance of SCP-990. According to a doctor's report (doctor's name classified), the agent described with great detail a series of events that would lead to several tactical nuclear missiles being launched into mid-Europe and eastern Asia, ultimately resulting in the extermination of nearly 98% of the human race and the total collapse of human society. He claimed that the information had been outlined to him by SCP-990 while he was trapped within his dream.
A mobile task force (designation classified) was dispatched to eliminate the initial threat that would begin the chain of events. The task force was successful and the crisis was averted. However, the agent didn't survive his ordeal and died of shock-like symptoms.