A detective chief inspector from 2006 is investigating a serial killer when he is knocked over by a speeding car. Waking up, he finds himself mysteriously transported back in time to 1973. Initially struggling to come to terms with his situation, he has to come to terms with the old-fashioned technology and attitude of the day, while figuring out how he came to be trapped in the past.
The series tells the story of New York City police detective Sam Tyler (played by Jason O'Mara), who, after being struck by a car in 2008, regains consciousness in 1973. Fringing between multiple genres, including thriller, science fiction and police procedural, the series remained ambiguous regarding its central plot, with the character himself unsure about his situation. The series also starred Harvey Keitel, Jonathan Murphy, Michael Imperioli, and Gretchen Mol.