Greg no tiene la confianza del Dr. Toth después de que se desmorone al saber que Ed ha sido disparado.

When a cop who mistakenly shot and killed a young boy is declared innocent, Team One confronts a rioting crowd and the father whose dreams died the night he lost his son.

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.

The Strategic Response Unit is called when a mother and daughter are abducted, and the only clue they have about the culprit could expose a dark family secret.

When Raf, a new recruit, joins Team One, he learns what it means to be a member of the Strategic Response Unit on one of their toughest days of the year for hostage and suicide situations.

Torn from his dying father’s bedside, Spike joins Team One to face their largest bomb threat yet, but realizes the only way to diffuse the bomb is to get inside the dangerous mind of its creator.

Hijackers commandeer a passenger jet to bargain for a prisoner release. The lives of forty passengers and crew hang in the balance of negotiations over the prisoner, a relative of the terrorists. An ambitious passenger irks the hijackers, when she starts to text the police. Team One eventually storms the jet at the city airport. Stressed, Parker agonizes over shooting the hijackers.

Team One tracks a masked gunman terrorizing a group of teenagers – and discovers troubling connections between an outspoken gay student, a manipulative therapist, and a young man desperate to win back his parents.

When a ransom drop goes wrong, Team One is drawn into the dangerous world of “express kidnapping” and the nightmare of a woman haunted by the brutal experience of captivity. Meanwhile, Greg finds out about Sam and Jules' secretly renewed relationship.

An armed robbery exposes a mother’s double life, while Ed gambles with his own safety and a promise he made to his family.

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 investigates a violent kidnapping in Chinatown where a store owner and his daughter have disappeared. They discover that a ruthless street gang is behind the crime and, in the process, uncover a tragic family secret.

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.

Spike responds to a distress call from Sam's sister and finds himself in a hostile situation. The rest of Team One races to a call at the ultra-secure Metro Evidence Depot and finds a deadly connection between the two cases - one that puts Spike's life on the line.

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

Dr. Toth confronts Parker with devastating news; Team One responds to a break-in at a bio-lab across town.

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.