The team members hunt for the gunman who shot Ed and learn that the shooter is linked to a drug lord. Meanwhile, Ed undergoes surgery; and his wife experiences complications while delivering their baby.

When Team One goes up against a notorious serial robber who streams his robberies on the live Internet, they discover there is more to this man’s mission than first appears.

Ed walks his friend Donna Sabine down the aisle. It should be the happiest day of her life, but the peaceful wedding is shattered by gunfire. Then Donna and Ed make a shocking discovery.

Team One races to Fletcher Stadium, where a knife-wielding robber has taken a hostage. When a security guard tries to be a hero, the situation turns bloody.

Team One is called to a high-security psychiatric hospital where a violent patient has taken a guard hostage and injured a fellow patient.

During the season four finale, Team One races to a hospital when Fire Captain Simon Griggs interrupts the attempted murder of a badly burned firefighter. When they corner the suspect, the team learns he’s behind a series of deadly fires in the neighbourhood. Meanwhile Fire Captain Simon Griggs is forced to make a horrific choice – one that pushes him to the edge of revenge and suicide. Parker, wrestling with his own decision about his future on Team One, must convince this broken man to live.