David tries to pick up the pieces of his life after his encounter with the Zero Legion only to be drawn into the hunt again by two mysterious law enforcers, Agent Fong and Agent Dhillon. Meanwhile, a new vigilante is on the loose, killing gangsters and child molesters, among others.

Maddy is being bullied in school. Beverly, her lecturer who is also a mentor for the Zero Legion, wins her trust by helping her exact vengeance on her aggressors. David’s relationship with Maddy goes downhill when he tries to get involved.

David helps the Task Force hunt down the vigilante who, like him before, has been forced by a Zero to execute Targets. When David finds out the vigilante, Sam, is a 19-year-old girl, he is conflicted about giving her up. He tries to stop Agent Fong but in the process, puts his own life at risk.

Beverly tries to convert Maddy over to the Zero Legion. Meanwhile, the Task Force closes in around Beverly, causing her to kidnap Maddy. David tries to intervene, only to find himself in a deadly life-and-death situation. Meanwhile, Sam seeks refuge at David’s flat.

There is a crisis at the Task Force Control Centre: the Zero Legion has hacked into their systems, thanks to a mole among the team. David, Agent Fong, Agent Dhillon and Ben are caught in the middle of a tense, action-packed showdown between good agents and their betrayers.

Zero One makes Maddy prove her allegiance to the Zero Legion by killing her first Target – Agent Dhillon. David is shocked when he finds out his own stepdaughter has joined the Zero Legion; he tries to find Maddy before she commits the deed.

Agent Fong gives David an ultimatum – hand over Sam or they will hunt down Maddy. David is forced to obey, but he is unaware that the Task Force already has plans of their own for Maddy.

Maddy heads to a remote island to rendezvous with Zero One as David and the Task Force try to trace her whereabouts. Julie returns to Singapore after a long soul-searching journey abroad and berates David for what he has done to Maddy. Sam, who is still on the loose, takes refuge with a trusted acquaintance from the past.

Agent Fong and David are taken hostage on the remote island by the Zero Legion and forced to undergo torture. Maddy – who is on the same island and now part of the Legion – is given the ultimate test: kill David.

When Maddy refuses to kill David, they are taken out into the forest to be killed. David manages to fight his way out – but now, they must return to the Zero Legion’s safe house to rescue Agent Fong. Meanwhile, Julie finds out the truth about the Task Force.

The Task Force Command Centre receives a surprise visitor – Sam, come to give herself up. Agent Dhillon races to locate David and Agent Fong, unaware of a surprise attack that is about befall the Command Centre. Meanwhile, David and Agent Fong try to find their way back to Singapore.

David, Julie and Maddy are now reunited, but for them, danger lurks just around the corner. Agent Dhillon and Agent Fong face the disbandment of the Task Force, just as new threats emerge.