While the future of the undercover operation is under threat, Church has several meetings with his informant, Dingo. Finally, he extracts details with will enable the Singers group to bust a big-time drug ring.

Church breaks all the rules when he goes after Rocca's attacker and ends up head to head with the new boss of Undercover.

The unit become involved in a robbery and double murder when they go undercover to infiltrate a group of high-rolling gamblers using black money.

A routine drug bust takes a sudden turn forcing Rocca to take the place of the target. Meanwhile, Church faces the challenge of a lifetime as he deals with a pregnant informant.

When Church and Mackenzie team up to investigate an illegal adoption racket, Mackenzie's informant decides to take justice into his own hands.

Following a car bomb attack, Stone and Angie go undercover to investigate a radical right-wing group suspected of race terrorism.

The Unit investigate a series of truck hi-jackings that have led to murder.

Church uses unorthodox methods during a drug investigation when he discovers his nephew, Matt, caught up in the cycle of addiction.

Church must team up with a new recruit to investigate the abduction of the daughter of a Family Court judge.

When Stone becomes the target of a revenge attack, Angie and his family get caught in the crossfire.

Working undercover in the music industry, Angie's life spins out of control as she begins to question her future in Undercover.

During an undercover operation, Church is involved in a shooting accident which brings him under scrutiny from Internal Affairs.

Working undercover in an explosives trading investigation, Stone allows his heart to rule his judgement, putting the operation and his life at risk.

Working closely with a psychological profiler, Mackenzie puts her life on the line to trap a serial killer who uses the internet to select his victims.

The Unit discover there is a contract out on Church's life. Someone wants him silenced before he can testify.

The Unit work to protect a coin dealer they believe will be the target of a revenge attack.

Mackenzie goes behind bars to investigate a murderer suspected of grand scale embezzlement.

Rocca goes undercover with Church on a case involving gold smuggling, political intrigue and attempted assassination.

Rocca finds himself in unfamiliar territory when he goes undercover with Church on a case involving gold smuggling, political intrigue, and attempted assassination.

The undercover unit faces a dilemma when the life of Church's informant is threatened. Should they abort the sting?

MacKenzie pushes Angie and Stone to solve the ongoing porn murder case, as the compromising photographs of herself and Church threaten the security of the Unit.

Stone and Angie go undercover to investigate a murder believed to be linked to a pornographic film industry. MeanWhile MacKenzie receives compromising photographs related to her past relationship with Chruch.