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Spooks, or MI-5, is a show about British spies that work in counter-terrorism. The show finished season/series 6 in late 2007 and is rumored that filming for the seventh series will start in 2008 - indicating that series 7 will air in the last quarter of 2008 or early in 2009 (all airdates are UK airdates).
The spies are collectively known as Spooks because of the shadowy nature of their existence. The Spooks use many different covers, and rarely get to use their real identities out in the open. These secret agents are tasked with the mission of protecting the national security of the UK.