Season 4

1. Snakehead

2001-08-14 · 60m

The Undercover Unit is called in to investigate when eleven illegal immigrants are found dead inside a shipping container.

2. Rich Man's World

2001-08-21 · 60m

Church uses an informant to infiltrate a drug syndicate, with tragic consequences.

3. Beyond Redemption

2001-08-28 · 60m

Angie goes undercover at a halfway house to obtain evidence against a psychopathic killer.

4. Tell Me You Love Me

2001-09-11 · 60m

Church and MacKenzie pose as a married couple experiencing relationship difficulties as they investigate a murder.

5. Fool to Want You

2001-09-18 · 60m

Church becomes the prime suspect in a murder investigation when he moonlights as a private investigator.

6. Family Values

2001-09-25 · 60m

Church goes undercover in a bikie gang to expose a major amphetamine ring, with unexpected and tragic consequences.

7. Whatever It Takes

2001-10-02 · 60m

The future of the Undercover Unit looks uncertain when Stone is investigated for the shooting death of biker Chicken Lake.

8. Into the Darkness

2001-10-10 · 60m

In the aftermath of Bill Hollister's murder, MacKenzie grieves while Church tries to bring the killer to justice.

9. Foster Cops

2001-10-17 · 60m

Church and Danni pose as foster parents in an unusual operation to capture Australia's Most Wanted Armed Robber.

10. The Whisper Room

2001-10-23 · 60m

The Undercover Unit investigates a group of paedophiles who use an internet chat-room to procure their victims.

11. Feud

2001-10-24 · 60m

The Undercovers investigate an extortion attempt against a pharmaceutical company and find themselves at the centre of a long-term feud.

12. One of Us

2001-10-30 · 60m

Stone is recruited by an Assistant Commissioner to assassinate the Bomb-maker responsible for Bill Hollister's death.

13. Dog Eat Dog

2001-10-31 · 60m

The Undercover Unit stage an intensive investigation to nail the ex-police officer believed responsible for Bill Hollister's murder.

14. Slice

2001-11-06 · 60m

Danni's cover is blown and her career is threatened when an escaped criminal seeks his revenge.

15. Love Hurts

2001-11-07 · 60m

A case of mistaken identity results in Stone being recruited to assist with a major armed robbery.

16. Psychotic Episode

2001-11-20 · 60m

Strange guns, UFOs, and piggerists with glass eyes - it's all in a day's work for Church, when his only source of information for a possible murder case is a paranoid schizophrenic.

17. Closure

2001-11-21 · 60m

MacKenzie investigates a Private Detective who specialises in adoption cases, with the secret hope of locating her birth mother.

18. True Colours

2001-11-21 · 60m

MacKenzie makes contact with her natural mother and both women become embroiled in an Undercover operation to nail a mastermind armed robber.

19. Too Many Crooks

2001-11-27 · 60m

The Unit works with an undercover operative from Queensland to defeat a gang of amphetamine dealers responsible for a kidnapping.

20. Just Another Day

2001-11-27 · 60m

Stone is caught in a siege situation at a hospital when an armed robbery goes horribly wrong.

21. Reunion

2001-11-28 · 60m

Church's worlds collide when he has to attend his twenty year high-school reunion as part of a drug sting.

22. Do the Right Thing

2001-11-28 · 60m

As Church, Danni, Stone and Angie focus on a drug sting, MacKenzie is distracted by an invitation to apply for Head of Homicide - which would mean leaving the Undercover Unit.