Emergency

adj. in the event of sudden need

n. sudden need demanding immediate action

An emergency is a situation which poses an immediate risk to health, life, property or environment. Most emergencies require urgent intervention to prevent a worsening of the situation, although in some situations, mitigation may not be possible and agencies may only be able to offer palliative care for the aftermath.
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Emergency! was a popular crime drama/medical television series that was produced by Mark VII Limited (Jack Webb's company) and distributed by Universal Studios. It debuted as a midseason replacement on January 15, 1972, on NBC, replacing the short-lived series The Good Life, and ran until September 3, 1977. It was produced and created by Jack Webb and Robert Cinader, both of whom were also responsible for the police drama Adam-12. The shows were similar in that they featured dedicated civil servants handling two or three varied and unrelated incidents during a typical shift.
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Emergency /emer·gen·cy/ an unlooked for or sudden occurrence, often dangerous. emergency, n life-threatening situation requiring immediate medical [more]Emergency - Community and Resources

Noun
1. a sudden unforeseen crisis (usually involving danger) that requires immediate action; "he never knew what to do in an emergency"
(synonym) exigency, pinch
(hypernym) crisis
2. a state in which martial law applies; "the governor declared a state of emergency"
(hypernym) temporary state
3. a brake operated by hand; usually operates by mechanical linkage
(synonym) hand brake, emergency brake, parking brake
(hypernym) brake

(n.)
Sudden or unexpected appearance; an unforeseen occurrence; a sudden occasion.
  

(n.)
An unforeseen occurrence or combination of circumstances which calls for immediate action or remedy; pressing necessity; exigency.