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A sleeper agent, also called sleeper cell, is a spy who is placed in a target country or organization not to undertake an immediate mission, but instead to act as a potential asset if activated. Even if not activated, the "sleeper agent" is still an asset and can still play an active role in sedition, espionage, or possibly treason by virtue of agreeing to act if activated. Sleeper agents may also work in groups of a clandestine cell system with other agents.