Team One is out to capture a man for the murder of his daughter after escaping from a transport van for prisoners.

Team One arrives on the scene of a bank robbery where a man claiming to be Roger Finch has turned to desperate measures after trying to withdraw $40,000 from his account. But the case is not so simple: the Team discovers the bank robber is actually Garth Scarrow (J.D. Nicholsen), and the real Roger Finch (Hamish McEwan) has gone missing. Finch has been kidnapped by the bank robber’s daughter, Ava (Erin Karpluk) and her husband Mark (Warren Christie). But it's not his money they're after. As Finch's secret past comes to light, the couple leads the Team to a hospital showdown. Roger Finch holds the key to a child's life... and Ava and Mark will stop at nothing to save their son.

The Team receives an urgent call from Jules (Amy Jo Johnson) on her day off – she and her date Steve are trapped in a restaurant with a gunman (Aaron Poole) who’s shot a waiter and is now holding hostages and making incoherent demands. Team One works with Jules on the inside, fighting to calm the gunman down before the waiter dies, but its clear there’s more to this simple hostage-taking. Team One discovers that this delusional man is merely a pawn in a much more horrific act of terror, targeting a local mosque.

Spike (Sergio Di Zio) discovers his former mentor may be implicated in a tangled case involving corruption, drug dealers and an attempted gang execution.

Complications arise in a high-risk SRU raid when an informant gets caught in a dangerous game of love, murder and betrayal.

Team One grapples with life and death choices and tough decisions that leave viewers wondering if the team will ever be the same again. Dr. Larry Toth (guest star Victor Garber), a military psychologist and ‘team-breaker’, peers inside the heads of Team One individually, exposing deep secrets and faults. With the fate of the Team hanging in the balance, Ed’s (Hugh Dillon) wife Sophie (Janaya Stephens) goes into labour, Parker’s (Enrico Colantoni) leadership is questioned, Spike (Sergio Di Zio) and Wordy (Michael Cram) stare down the barrel of a life outside the SRU, and Sam (David Paetkau) and Jules (Amy Jo Johnson) must confront whether they’re willing to give up the job for each other. As Parker waits to hear the fate of his team, a devastating call comes into the station, involving one of his own.

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 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.

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.

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.

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.

Team One must keep the peace when a broken, volatile man goes to dangerous extremes to set things right with his ex-wife and his estranged daughter.

A gunpoint abduction at a doctors office puts Team One on a collision course with a desperate felon as his bleeding sons life rests in Sam's hands.

Team One is on the trail of the notorious Business Card Bandit only to discover the shocking truth about the robbers identity.

Team One is stunned when someone hacks into their ultra-secure computer system -- to show the team the video of a crime in progress. The team speeds after the thieves, who've stolen an eighteen-wheeler full of volatile chemicals. Ed is forced to take a risky sniper shot as Spike tracks down the hacker (Kris Lemche) who set Team One on the case. Untangling the hacker’s motives, Spike finds a young man who's put his life at risk to rescue the girl he loves (Meaghan Rath).

On the trail of a serial killer, Team One must convince a haunted, frightened man to reveal his darkest secret to save the life of an innocent woman.