Life on Mars (US)
Life on Mars (US) was a remake of the UK series of the same name that aired on ABC for one season from October 2008 through April 2009.
Jason O'Mara starred as NYPD detective Sam Tyler who, after being struck by an automobile in 2008, wakes up in 1973. It isn't clear to Tyler whether he's really gone back in time or may be dreaming while in a coma.
An unaired pilot was filmed titled "Hit and Run" which, with the exception of Jason O'Mara, had a completely different cast of characters.
See also Life on Mars (UK).
The Complete Series
Original air dates: 10/09/2008 to 04/01/2009