Tactical Response attempt to find a sniper on the run, with an city under fire, the teams swiftly respond however struggle to find a reason for the gunman's actions.

A terrifying cyber assault on the city brings Josh and Tash together as they race against time to save the life of a badly injured woman. As the attacks increase in severity, Leon and Audrey must call on all their know how as they battle a faceless opponent who may be more than a match for them.

The Tactical Response team continue their search for the man they believe is responsible for both the Police Minister and Michael's murders, as well as Josh's possible disappearance. They find out that he steals identities off people as a means of not being caught out, and Lawson has to make a big decision in order to catch him.

Josh's proposal to Tash is interrupted when ESD storm Tash's house and arrest him. Facing charges of corruption, Josh realises that his arrest is closely linked to the earlier attempt on his life, as he strives to clear his name once and for all.

Michael has been a busy man since being fired from Tactical Response. Thanks to the squad's head honcho Kerry he's now undercover, and his job is to bring down the Raineys, a family team of cocaine importers. He sets up a buy-bust meeting in order to bring the Raineys down and coaxes Josh into becoming his wingman. The trade-off location changes at the last minute and whilst TR catches some of those responsible. Col Rainey has taken Michael and gone underground. Has his desire to prove himself to everyone put his life in serious danger? Meanwhile, Shannon finds herself face-to-face with her attacker.

With a renegade Josh risking everything to find Michael's killer, the team finds themselves chasing one of their own and are forced to confront the question of how far they'll have to go to stop him.

Senior Constable Michael Sandrelli remains in intensive care whilst Tactical Response are left to pick up the pieces. Meanwhile, Shannon lets her emotional guard down.

The team finds a special way to honor their mate. Stella gives Lawson a hard time about not wanting to say anything at the funeral. Kerry is shocked when her son James is arrested for assault on a flight from Vietnam. When the car they are travelling in is run off the road, James sees the men in the other car and runs. Kerry and TR then find themselves in a race against time to save him from two violent drug runners.

When Andrew Kronin stages a brazen escape, Michael struggles with past demons as TR hunt down the armed robber and murderer. Burning for revenge, Michael is helped by Lawson to come to terms with his feelings.

As TR, along with the drug squad, work to catch a well known drug gang, Kerry's efforts to save Blake, a meth cook and reformed drug addict becomes personal when, devastatingly, she finds out that her son James is battling his own addiction. Meanwhile, Josh finds himself fighting for his life when an unknown man breaks into his apartment and tries to kill him.

Headstrong Kerry is dismissive of her own safety but when the threats are redirected to her son, her anger at the perpetrators can't be contained.

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.

Tactical Response find themselves up against a carefully planned manoeuvre when Lawson and others are taken hostage by the Cuckoo as part of an escape attempt from a military courtroom. As part of the team negotiates for Lawson’s freedom, Josh and Stella follow their own investigation: searching for a bomb.

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.

TR score a lead when an ordinary civilian unwittingly implicates himself with Andrew Kronin's gang. As Lawson pushes the man to get to Kronin, Dom takes umbrage. Dom snaps, turning his gun on TR and flees. As TR 2 track down Dom, Lawson exults when he recovers a substantial amount of the heist money.

As Lawson's growing obsession with the robbery crew threatens to pull Tactical Response apart, Josh shows his leadership as TR2 assist Drug Squad with the arrest of a drug importer. But things aren't as simple as they first seem when TR discover the offender's niece has been kidnapped and held to ransom. Josh must race to save the girl, in the process meeting her mother, Tash, who will change everything.

Tragedy can have a profound effect on those involved. Everyone has different coping mechanisms, and Tactical Response continues to reel from a tragedy within their own ranks. Stella can barely build up strength to face the day and Christian appreciates a comforting presence from Amber. Josh, feeling responsible and immense guilt from what has happened, goes underground, deliberately avoiding contact from anyone at TR.

A discussion about Kerry's birthday leads to a bet on who in the team will have sex with her. Meanwhile, Leon investigates a series of video store robberies, only to be caught in a robbery himself.

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.

When a baby is abducted Lawson races to find the kidnappers before the child's grandfather, a known criminal figure, finds them first. Meanwhile, a man threatens to jump from an apartment building after his girlfriend goes missing.

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.

TR go bush for a routine training exercise. Unbeknownst to Lawson and Josh, the younger members of the squad soon find themselves at the mercy of Oliver Ginsberg, who has rigged the forest with deadly traps. When they discover Ginsberg is on his way to the city with a van full of explosives, they realize the worst is yet to come...

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.

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

Stella, Shannon and Josh help to settle a violent ethnic dispute. Lawson, Michael and Christian are on the trail of a volatile young couple who are desperate to get married, and meanwhile, Josh receives a drunken phone call from teenager Minka, who is the daughter of Tash, and Kerry receives a surprise visitor.

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.

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.

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

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.

When a family court judge is taken hostage by a disgruntled father, TR tries desperately for a peaceful resolution. As the situation escalates, Shannon is in a race to talk him down before Josh is forced to shoot him. While Lawson’s attempts to catch a killer are hampered by journalist Jacinta Burns.

After rescuing two children, Josh's rage spills onto their father, who may have attempted to kill them. The new inspector challenges Josh's position on the team

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.

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 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.

When John Welsh, an ex-SAS soldier robs a petrol station, TR join with a major crime squad to help bring him down. A drug-related story Jacinta is investigating ends up putting her life at risk. Lawson tries to protect her, but finds she is quite unwilling to accept his help.

Tactical Respose race into town, on the hunt for Oliver Ginsberg. They learn that Ginsberg has placed a very large bomb under the city and that he has plenty more deadly tricks in store for them. Lawson finds himself in an awkward position when he must work with Dom, now a member of the bomb squad, to defuse the bomb.

When the TR team intercepts a known drug dealer, they discover that a robbery is about to take place, which then turns into a siege when the robbers take hostages. One of the criminals falls into a basement beneath the bar and later dies. Dom goes in to try to convince the robbers to stop, but the owner of the bar is shot by a spear gun. Eventually, one of the criminals gives up while the other is arrested

TR is given the responsibilty of protecting an underworld figure, who is testifying in court. A decoy is used, with an actor playing the man, but it goes downhill after the actor is shot dead. Serveral more attempts were made, and Kerry comes up with a unique way of protecting the man. Josh takes the man by himself, but is later cornered by the people trying to kill the underowrld figure. As they leave, TR shows up and the men are arrested. The episode ends with Micheal kissing Stella as she sleeps, and Kerry and Lawson having a conversation about the report on TR that Kerry wrote

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

The team find themselves in unfamiliar territory when Christian is taken hostage during a siege at an army barracks. Christian's philosophies are challenged when his captor forces him to choose between killing a guilty life or saving an innocent one.

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 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.