A suspected criminal mastermind escapes from police custody, throwing the city into turmoil. With the police department now divided, rival police chiefs are forced to take their fight to the streets of Hong Kong with deadly consequences.

Wanted criminal "Helios" and his assistant stole a quantity of uranium and plan to produce weapons of mass destruction. They are planning to trade with a terrorist organization in Hong Kong. Chief Inspector Lee Yinming and Inspector Fan Kaming lead the Counter Terrorism Response Unit of the Hong Kong Police Force. Along with a Chinese senior official, a physics professor, and two South Korean weapon experts, they hope to defuse a crisis sufficient to destroy the world.

Five police officers in Hong Kong are kidnapped. The police commissioner is on a business trip overseas. Two vice commissioners, Sean Rau and M.B. Lee, then take over the case. The two vice commissioners are rivals who both vie for the police commissioner seat. At first, M.B. Lee takes the lead in the case, but comes to a dead end. Sean Lau then takes the lead, but he falls into a trap. Both men are then investigated by the ICAC (Independent Commission Against Corruption).

Rumor has it that “Black Moly”, the Indian head of a gang has returned. His former subordinate Velu is released from prison, he refuses to follow the same path as before. But he is misconstrued by his buddy, Sonu that Velu betrays him. Sonu accepts the task for killing PTU’s Team Head. Sam and May from PTU and Velu can’t easily leave themselves out of account.

Sergeant Tong is wracked with guilt after he unwittingly kills a young girl whilst capuring a criminal named Cheung. When the girl's sister is later kidnapped in a ploy to get Cheung released, Sergeant Tong vows to find and rescue her before she comes to harm.

After a late-night triad dispute leads to the death of an innocent civilian, PTU officers take action by investigating triad activities in the area.

Tensions flare between PTU officers and the Complaints Against Police Officers unit when a security camera captures a triad member being brutalized by PTU officers.

For never-do-well compulsive gambler Fong, there's only one thing more fearsome than debtors at his doorstep - having to coax a crying baby. But what if the baby becomes his golden goose to fend off his debtors? Can he overcome his phobia of diapers, milk bottles, and cloying lullabies?

A friendship is formed between an ex-gangster, and two groups of hitmen - those who want to protect him and those who were sent to kill him.

The story of a couple who break up one morning and proceed to find their love tested in unexpected and violent ways.

Michael is a cop chasing uncommon serial killer Sung Ping, who one day kills off a scummy triad on almost a whim. Liking the aftermath, he proceeds to plan his next few killings much to the dismay of the local triads. Meanwhile, reporter Hak makes the real-life crime drama the fodder for his crime fiction serial. Before long, Ping begins using the fiction to fuel his own plans, and soon Hak is concerned that he may be responsible.

A streetwise young man becomes a bodyguard to score quick cash. He befriends a disillusioned mercenary determined to begin life anew. They find themselves working together to foil an assassination attempt, but their partnership can't last.

Despite negative psychological evaluations, Mike Wong is assigned as the captain of the SDU, a special task force linked to the Customs Department. Their mission: apprehend nasty drug dealers, led by the “Ice Queen.” To do this, Mike has to team up with customs cop Minnie. Despite their clashes, the two learn to understand each other, but not before things get bad.

A man re-evaluates his life after being given a second chance. When seedy cop Liu Chen-hai is shot, he is forced to do some soul-searching about his old life.

The story follows Hunter and Yat, two new hot shot recruits, who under the watchful eye of their commanding officer, Yuk Pai, rise quickly through the ranks, enduring much mental and physical hardship along the way. Their new found skills are put to the test when renegade SDU member returns from seclusion in Thailand to wreak havoc on Hong Kong and the SDU's most secret missions.

A look at the SDU in the Royal Hong Kong Police Force - how members are selected, how they are trained, their lives, what they think, the relationships between SDU members and their friends and the pressures they face.