A group of Afghani asylum seekers have seized control of Frankston’s Peninsula Centre and taken several hostages, including the son of the Minister for Immigration. With the siege now in its thirty-third hour, TR’s stamina is put to the ultimate test as Lawson starts to question the integrity of his key interpreter.

When a taxi driver assaults Shannon, Tactical Response links the incident to a spate of attacks against female passengers. As Tactical Response searches for the driver, Josh struggles to contain his anger. Tactical Response responds to a disturbance at a swinger's party only to discover the gatecrasher is a disabled woman. Meanwhile Lawson's love life takes a turn for the worse… or does it? He offers Shannon his spare room — will she shack up with her ex?

Lawson extracts an undercover operative from a drug syndicate only to discover she has crossed the line and is pregnant to a known criminal. Tactical Response races to track her down before her boyfriend discovers she is a cop. Lawson and Shannon negotiate the awkwardness of their personal and professional relationship.

Lawson tries to save Caleb from a life of crime, only to discover it's already too late. Meanwhile, Dom's home life explodes when Sandrine's depression threatens to harm their baby.

A criminal in custody escapes from the prison van he is being tranported in, and makes an audacious break for freedom. In doing so, he assaults Grace and takes a woman hostage. He then forces Josh to drive him around town before playing a little Russian Roulette. However, Josh is saved and the criminal is arrested

When a group of students are lured into being drug mules, TR races to stop them, as Kerry warns Lawson he risks compromising a federal investigation.

When teenagers blow up a series of parking pay stations, TR races to prevent them killing themselves and innocent bystanders.

TR assists in the removal of underage girls from a community where reports have been made of inappropriate behavior. The situation turns serious when a member of the community hijacks a bus and demands the girls be released. When the hijack escalates, Lawson is forced into action with devastating consequences for the team when it is revealed one of them is responsible for the shooting of an innocent man. Stella clashes with Lawson as the team waits for the ballistic report.

When TR is called to a domestic dispute, Lawson connects with a young boy struggling to care for his drunken father; Michael discovers being a hero isn't all it seems.

Stella's future in Tactical Response is threatened when she becomes involved in an illegal car race. Kerry faces the coronial inquest into the cyclist's death. Later, Boyd visits Kerry at home with a peace offering and Dom finds a creative solution to an unusual situation at a strip club where an out of control father demands to see his daughter.

TR is called to a domestic siege on the outskirts of Melbourne where they journey into dense bush to save a young boy. When Josh is shot, Lawson faces a dilemma in how to neutralise the boy. Meanwhile, Kerry receives the brief for the coronial inquest and must prepare to face the consequences of causing a cyclist’s death.

Michael and Josh clash when dealing with a delusional man. Tactical Response races to stop a woman murdering her husband. Meanwhile, Lawson and Jacinta renegotiate their relationship when Jacinta spends a day travelling with TR.

Lawson and Josh come to blows when Lawson discovers Josh's relationship with Shannon. Meanwhile, Tactical Response tracks an escaped criminal who Josh believes has been wrongly imprisoned. Lawson tries to locate an elderly couple who were seen scoring drugs and have left suicide notes for their children.

The Tactical Response team investigate an attack on a police helicopter and multiple car bombings, however only after time passes, they realize it is all part of a cunning plan to rob a money-holding accommodation, learning this the teams pursue the case.

Josh, Grace and Michael investigate when an alarm is going off at a high-security laboratory. They find that an animal rights activists group calling themselves 'Freedom From Torture' has freed almost all of the research animals from their cages. Michael is bitten by a monkey who is later found to have herpes

Michael is found cleared of the herpes. The team arrives at a big surburban party and find a group of teenagers have stolen a gun from a security guard. Stella and Michael then go undercover to try and retrieve the stolen weapon. Michael then saves a high school boy from being severely beaten by kids from a rival high school

When a politician’s daughter and her school friend are kidnapped, the team is asked to run a covert operation to get the girls back safely. After it goes wrong, the team discovers the daughter and her friend set the ransom up, before they need to be saved from a lying con-artist.

After a nasty domestic dispute, the TR team are called to look for a man, who has hospitalised his wife after an argument. The team reveals he has a gun, as-well as his son. Lawson has the job of calling him down from a rooftop.

When a container of illegal weapons is broken into, Josh and Dom race to save the life of a security guard, who has a bomb strapped to her body, and attempt to find the men responsible. Lawson, Michael and Shannon deal with a disgruntled worker, who is holding his boss against his will.

Lawson, Shannon and Stella race to save the lives of college students when two teenagers go on a rampage at a college campus. Dom and Michael attend an armed robbery to find the gunman has been attacked by a security dog and is missing an ear. Josh, on suspension, visits Gabe, a psychologist to deal with his anger issues.

TR find themselves having to work with a slick, well-run private security firm to save the life of a kidnapped businessman. But is their leader, Michael Shmitt, all he is making out to be or does he have other plans in mind?

Stella is caught in the crossfire when an informant is removed from witness protection against his will. When the negotiation takes a turn for the worse, Stella has to deal with the consequences of Alana being taken hostage. Josh and Shannon stake out two hapless crooks who are planning an armed robbery. Michael delivers a baby and finds himself a changed man.

Meanwhile Melbourne’s water supply is contaminated by a woman who believes fluoride in the water has killed her husband, and Michael’s faith is tested when he loses a large sum of money while swimming with two underage girls.

Lawson and Grace try to talk-down a troubled teenager when she threatens suicide, trapped on a rooftop with her young boyfriend. She was later found to have killed her boyfriend's father. Grace's inexperience is quickly revealed when she tries to fix the situation, which ends in the young woman's tragic death.

The TRG is called out to a sports oval where a heavily-armed gunman shoots Stella, who is saved by her kevlar vest. When the gunman requests to meet with a senior officer, Lawson approaches him and finds he was actually a former weapons-master who intends on suicide-by-cop. The situation ends when, after trying to avoid shooting the man, Lawson is forced to shoot and kill the man when he pulls a handgun on him.