Season 4

01 Snakehead Episode 114th August 2001 The Undercover Unit is called in to investigate when eleven illegal immigrants are found dead inside a shipping container. 02 Rich Man's World Episode 221st August 2001 Church uses an informant to infiltrate a drug syndicate, with tragic consequences. 03 Beyond Redemption Episode 328th August 2001 Angie goes undercover at a halfway house to obtain evidence against a psychopathic killer. 04 Tell Me You Love Me Episode 411th September 2001 Church and MacKenzie pose as a married couple experiencing relationship difficulties as they investigate a murder. 05 Fool to Want You Episode 518th September 2001 Church becomes the prime suspect in a murder investigation when he moonlights as a private investigator. 06 Family Values Episode 625th September 2001 Church goes undercover in a bikie gang to expose a major amphetamine ring, with unexpected and tragic consequences. 07 Whatever It Takes Episode 72nd October 2001 The future of the Undercover Unit looks uncertain when Stone is investigated for the shooting death of biker Chicken Lake. 08 Into the Darkness Episode 810th October 2001 In the aftermath of Bill Hollister's murder, MacKenzie grieves while Church tries to bring the killer to justice. 09 Foster Cops Episode 917th October 2001 Church and Danni pose as foster parents in an unusual operation to capture Australia's Most Wanted Armed Robber. 10 The Whisper Room Episode 1023rd October 2001 The Undercover Unit investigates a group of paedophiles who use an internet chat-room to procure their victims. 11 Feud Episode 1124th October 2001 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 Episode 1230th October 2001 Stone is recruited by an Assistant Commissioner to assassinate the Bomb-maker responsible for Bill Hollister's death. 13 Dog Eat Dog Episode 1331st October 2001 The Undercover Unit stage an intensive investigation to nail the ex-police officer believed responsible for Bill Hollister's murder. 14 Slice Episode 146th November 2001 Danni's cover is blown and her career is threatened when an escaped criminal seeks his revenge. 15 Love Hurts Episode 157th November 2001 A case of mistaken identity results in Stone being recruited to assist with a major armed robbery. 16 Psychotic Episode Episode 1620th November 2001 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 Episode 1721st November 2001 MacKenzie investigates a Private Detective who specialises in adoption cases, with the secret hope of locating her birth mother. 18 True Colours Episode 1821st November 2001 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 Episode 1927th November 2001 The Unit works with an undercover operative from Queensland to defeat a gang of amphetamine dealers responsible for a kidnapping. 20 Just Another Day Episode 2027th November 2001 Stone is caught in a siege situation at a hospital when an armed robbery goes horribly wrong. 21 Reunion Episode 2128th November 2001 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 Episode 2228th November 2001 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.