Working undercover with armed robber Damien Broadbent, a masked Leo Flynn is forced to steal the proceeds of an illegal poker game at gunpoint.

Church's career is on the line when a federal police officer learns of his contrived relationship with the daughter of an illegal immigrant.

Drug dealer Charlie Sanderson tries to romance undercover officer Chris at a buy bust. Charlie offers to act as an informant for the police in his father Ned's drug organisation. But he has a condition -- Chris must go on a date with him.

After a wild night, Flynn wakes up in bed with a corpse, and has difficulty proving he's not the killer.

Church's efforts to nail a high profile people smuggler are thrown into chaos by a rogue Homicide detective hell-bent on playing undercover cop. Angie reconsiders her future in Homicide.

When a surveillance target unexpectedly collapses with a heart attack, Church is forced to step into his shoes as a hitman in a desperate attempt to save a kidnapped girl.

Eight months have passed since we last caught up with the Undercover Unit. Chris has pulled through and almost completed her rehabilitation. She has moved in with Leo, who has helped greatly in getting her back on her feet.

Angie faces an enormous decision regarding an aspect of her relationship with Harris and Chris' life is left in the balance when she rekindles an old relationship.

A teenage love affair involving one of the team's children puts the operatives at risk on a major drug job.

Flynn finds himself in a treacherous love triangle when he is seduced by a colleague.

Disillusioned with her new husband, Angie leaves him and transfers to Homicide.

With Harris confined to a psychiatric hospital for ECT treatment, his nemesis, Brett Linton, abducts Angie.

Angie and Harris' wedding day promises to be the happiest day of their lives. There's just one minor hitch.

Brett Linton, the man who has been blackmailing Luke Harris for several weeks, turns up on Angie's doorstep claiming he is looking to buy her car.

Harris is blackmailed by an adversary from his past who threatens to reveal his psychiatric disorder. Meanwhile, Angie receives a proposal of marriage.

The gang try to find Gail Lynch's husband who is out for blood, but will she fold under the pressure? will she tell them where he is.

While playing nanny to the daughter of a suspected hitman, Chris is horrified by the child's revelation. Luke grows increasingly agitated while dealing with his blackmailer's ever-changing demands.

Sophie takes Church to lunch with two of the state's biggest criminals. But will the meal be Church's last? Harris is blackmailed by an adversary from his past who threatens to reveal his psychiatric disorder.

After Flynn is almost killed in a buy bust gone wrong, Church goes undercover as a spiritual medium to hoodwink an international gun runner.

Leo goes undercover in order to bust a racehorse stealing, coke dealing porn king. Meanwhile Church has a surprise meeting with prostitute Lauren Davies.

Sleeping with the enemy proves to be a dangerous cocktail for Church when he goes undercover in a dodgy furniture removal company to bust an interstate ecstasy shipment.

Chris risks her life and puts her sexuality on the line to sting a sadistic chef for murder.

Flynn endangers his life and that of his pregnant sister on a deadly assignment with two cop killers. Church faces legal repercussions for taking the blame in the shooting death of Laurie Nicholls.

Church makes a dangerous call when faced with a conflict of loyalty between Harris and his old boss, Bernie Rocca.

A sexual indiscretion of Harris' comes back to bite him on the arse when a demented woman sets her vengeful sights on Angie. While working undercover, church is hired to perform a hit on a colleague.

Special Operations and the Drug Squad simultaneously pursue a suspected European war criminal and her drug-dealing son, thwarting Harris and Angie's attempts to consummate their romance.

Angie's latent feelings for Church resurface when a young deaf girl arrives at Police HQ declaring she's his daughter. When Harris uses her to solve a crime, all hell breaks lose.

Harris takes an impulsive trip to Singapore in an attempt to win Angie's heart and protect her from Internal Affairs. This plan backfires when she and her sister are taken hostage by a drug boss.

New rookie Leo Flynn takes the undercover unit on a wild and merry dance, investigating a drug war between two rival ice cream vendors and ends up biting off more than he can chew.

When Special Operations investigate a renegade young detective working subversively in a suburban station, they discover he has all the qualities to become the new undercover recruit.

Christina's relationship with a lesbian clubber turns to tragedy when she discovers that her lover is a murderer.

Church embarks on his latest operation, infiltrating a Jewish crime family. But is the seasoned undercover operative going too far when he fakes the murder of a security guard to truly ingratiate himself with the family?

Church and Angie penetrate the liberated world of swinging couples and find that love really is a drug.

While investigating the murder of a friend, Church loses Angie's heart to his boss, Luke Harris.

Angie, Harris and Sophie lose a colleague when a siege situation erupts at Police Headquarters. Special Investigations welcomes a familar face as its newest member.

Chris Dichiera's future is jeopardised when she's forced to shoot dead a former acquaintance who is looking to settle on old debt

Angie meets with two brothers, who are looking for a nurse to do a mysterious job. She's amazed when she's quickly hired by the pair and has to accompany them on the job immediately.

Harris attempts to teach a mate a lesson in crime and punishment, but his plan backfires with disastrous consequences. Meanwhile, news of Church's tape-recording implicating Ingrid Burton has been leaked to the papers.

Angie is undercover in an Art Gallery looking for an insider connection to a spate of robberies when a balaclava clad bandit bursts in. The gallery manager is held at gunpoint while the rest of the staff are forced into the storeroom.

With Ingrid missing for seven days, the intensive police search to find her begins to lose momentum with everyone beginning to believe they're looking for a body.