In the mid 1970s, Kiwi charmer Terry Clark and "Aussie" Bob Trimbole form a deadly alliance that will change the face of Australian crime forever.

Anti-drugs campaigner Donald Mackay makes deadly enemies with the Griffith mafia and corrupt NSW police. Melbourne crim Ray Chuck plans Australia's most audacious heist - the Great Bookie Robbery.

A naive young Kiwi, Allison Dine, is swept off her feet by Terry Clark, becoming his lover, and most inventive drug courier.

Melbourne standover men Brian and Les Kane have ventured into unfamiliar territory by providing protection for Bob Trimbole's Melbourne heroin dealers. But things turn sour when dealer Wayne Robb is robbed of $200,000 cash on the Kane's turf. The Kane's suspect it was Vinnie Mikkelsen and Laurie Prendergast, two of Ray Chuck's mates from the Great Bookie Robbery.

In episode seven of Underbelly, Terry decides to franchise his crime empire and expand into the UK market. Aussie Bob goes to extreme lengths to buy out Terry's share of the Organisation.

Allison questions her role in the Mr Asia syndicate after her life is threatened by a corrupt Federal Narcotics Bureau agent. Colourful racing identity, George Freeman, takes extreme action after police raid his illegal casinos. The Mr Asia syndicate suffers a major setback when a drug courier is arrested.

Aussie Bob Trimbole is pressured to arrange a gangland hit on his friend and colleague, Allison Dine. Meanwhile, paranoid and living in exile in the UK, Terry Clark must terminate his relationship with "Mr Asia". Also, George Freeman is determined to get revenge on his would be assassin, and aspiring hitman "Mr Rent-a-kill" gets his big break.

Terry Clark's drug empire starts to unravel when he is arrested for murder in the UK, while Allison is arrested by the FBI and becomes a star witness against organised crime. With his heroin supplies drying up, Aussie Bob plans Australia's biggest ever cannabis smuggling operation. Meanwhile, the Federal Police have a major win against corruption at the Narcotics Bureau.

The Federal Police prepare to arrest crime boss and cancer sufferer Aussie Bob Trimbole. But a mole within the Feds threatens to create havoc with their investigation. Also, Alison Dine testifies at a coroner's inquest, and blows the lid on the Mr Asia syndicate.

Australia's most dangerous hitman, Chris "Mr Rent-a-Kill" Flannery, moves to Sydney to build his deadly reputation. Terry Clark's UK murder trial reaches a sensational climax, but can Allison testify against her former lover? Meanwhile, Aussie Bob gets involved in arms smuggling for the IRA.

In the series finale of Underbelly, Chris "Mr Rent-a-Kill" Flannery becomes a victim of his own success. But who would dare order a hit on Australia's most dangerous hit man?

Ambitious teenager John Ibrahim earns respect when he cheats death and buys into his first nightclub. Naive country girl Kim Hollingsworth takes her first steps into prostitution, starting a chain of events that will rock the Golden Mile.

Corrupt detectives organise an elaborate drug "sting" for their own profit. Meanwhile, senior police fear rampant corruption could lead to a royal commission.

John Ibrahim dodges death after being shot, and gets some powerful career advice from George Freeman. Detective Trevor Haken strikes a profitable deal to control the drug trade in Kings Cross. Kim turns her back on prostitution and applies to join the NSW Police.

Kim Hollingsworth organises a strip show for a police charity. Smalltime bouncer Benny Kassab has an audacious plan to become King of the Cross. Bill and Louis Bayeh fight off threats to their drug dealing empire. Trevor Haken's alcoholism takes a toll on his marriage and his ability to manage police corruption.

Louis Bayeh vows to avenge the drive-by shooting of his house. Debbie Webb becomes a whistleblower on police corruption, with shocking results. Kim Hollingsworth plans revenge on a police officer who betrayed her trust.

Corrupt cop Dennis Kelly tries to further his career by joining the National Crime Authority. With her career in tatters, whistleblower Debbie Webb makes a fateful decision to join the fraud squad. Fed-up with prostitution, Kim Hollingsworth considers her career options.

John Ibrahim is under pressure following a spate of gang violence on the Golden Mile. Debbie Webb finds a powerful ally in her fight against police corruption. Kim Hollingsworth tests the loyalty of her new boyfriend with a sexy challenge. Dennis Kelly uses all his cunning to turn a corruption allegation into a career opportunity.

Kim Hollingsworth finally reaches breaking point when her friend Wanda is found dead. Politician John Hatton achieves his goal of a Royal Commission into police corruption, and the announcement of a Royal Commission has an unexpected bonus for John Ibrahim.

Under pressure from the Royal Commission, Trevor Haken's paranoia reaches new heights. Drug boss Benny Kassab suspects a rat in the ranks, with deadly results. Police cadet Kim Hollingsworth is haunted by her colourful past.

Supergrass Trevor Haken risks everything to gather evidence against his mates. Chook Fowler takes bizarre steps to avoid testifying on police corruption. Kim Hollingsworth's police career is jeopardised when she agrees to go undercover for the Royal Commission.

Corrupt cop Dennis Kelly betrays his best mate to the Royal Commission, with tragic results. Gerry Lloyd makes a deadly deal with drug boss Shaka to expose corruption on the Golden Mile. Kim risks her life by going undercover for the Royal Commission. When the operation ends, she receives a shocking reward.

Danny "DK" Karam recruits his own private army to terrorise the Golden Mile. Ruthless newcomer Doc Kanaan stages a bloody coup to seize control of the drug trade from DK. With the corrupt cops banished from the Golden Mile, gang violence spirals out of control.

In the explosive final episode, Doc Kanaan plots to kill John Ibrahim and gain control of the Golden Mile. Joe Dooley and Strike Force Lancer smash DK's Boys and restore order to Kings Cross. Dennis Kelly hires a hitman to clean up his dirty past, as he lobbies for the job of Police Commissioner. Kim risks her life to avenge her unfair dismissal from the police force.

The true story of glamorous crime queens Tilly Devine and Kate Leigh, and their deadly battle to control Sydney's underworld in the 1920s.