While investigating a child's kidnapping, Sam discovers some disturbing information about his father, as well as the real reason he disappeared for good on the day of his fourth birthday party.
Sam goes undercover to bust an Irish mobster, only to cross paths with himself and his mother one more time, as well as his former babysitter, who is the sister of his main target
Sam partners up with his future police mentor in 1973 to find a Puerto Rican man accused of throwing a black girl off the roof of a building--a case that has the black community up in arms and demanding retribution.
The precinct goes into lockdown when a councilman is shot and killed in the station. But before he is killed, the councilman tells Sam that he is from 2009 and that he has found a way to get back home.
Irish mobster Jimmy McManus is shot dead after shooting Ray and Chris. The evidence suggests that Sam is the killer, but he insists that he is being framed.
While investigating the murder of a newspaper columnist, Sam crosses paths with a dangerous killer from one of his cases in the future and is convinced that he is guilty of this crime.
When a decorated Vietnam War vet is beaten to death, Sam's precinct is pushed to the brink to find his killers, but not everyone may be happy with the results they find.
Sam helps resolve a hostage situation at the psychiatric ward of a hospital, and the kidnapper's deadline turns out to be the exact same time that the plug is going to be pulled on Sam in 2008.
Hunt gets the precinct in the middle of a turf war with a rival from another precinct in a bank robbery case involving the Russian mob. Meanwhile, a new romantic interest emerges for Sam.