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Sam Tyler is a DCI in the 2006 Greater Manchester Police force. After being hit by a car, Sam wakes to find himself in 1973 - only four years after his birth. Unsure whether he is in a coma and dreaming, mad, or if he has actually gone back in time, he finds he is a DI in the contemporary police force of the age, starting his first day in a new precinct, and has to prove himself to his new DCI, Gene Hunt.

(wikipedia.org)