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Church becomes implicated in murder conspiracies when he goes undercover.

When a police officer is shot, Undercover are called to investigate the prime suspects within a Romanian gang.

When a serial killer claims a third victim, Undercover are called in to track him down.

The unit goes into damage control after Kaye's disappearance.

While undercover, Church becomes involved with Cameron Fraser, a brutal and highly skilled mercenary.

Stone goes undercover to crack a large-scale Ecstasy racket.

MacKenzie goes undercover to befriend a women capable of exposing a corrupt politician.

Working undercover, Church inadvertently becomes involved in a volatile siege situation instigated by three young delinquents.

Internal Affairs raids the Stingers warehouse after receiving a tip-off suggesting corruption. Bernie Rocca becomes the focus of the corruption allegation when he can't explain why some heroin is missing and why there is a spare $40,000 in his safe.

Church gives a long-term informant one last chance to prove his worth, while investigating a potential armoured car robbery.

Church goes undercover with a bikie gang suspected in producing counterfeit money.

After being shot at a drug deal, Stone remains undercover to crack a gun dealing racket. Mackenzie is concerned about the psychological effects the shooting may have on Stone and his future as an undercover operative.

The Unit goes undercover to locate a prison escapee and investigate claims that police want him dead, rather than recaptured.

Stone and Angie go undercover to infiltrate a radical environmental group suspected of stealing explosives to service terrorist activities; Church must overcome a personal vendetta.

Stone and Angie go undercover to infiltrate a radical environmental group suspected of stealing explosives to service terrorist activities; Church must overcome a personal vendetta.

Mac and Angie go undercover in a brothel following the murder of a second prostitute.

While investigating a murder, Church inadvertently becomes involved with a well known crime family.

As Church works to infiltrate a powerful crime family, he gets more involved than he had ever expected.

As the Unit slowly gains information to bring about the downfall of a powerful crime family, an unexpected development threatens their progress, and forces Church to remain undercover.

The Unit fears that Church's involvement with an influential crime family may cause him to cross the line, and betray them for a life of crime.

The Unit discovers that someone has information that could expose Church while he's undercover, and so begins a deadly race against time.