After enjoying a rare vacation, Scott (Sullivan Stapleton) and Stonebridge (Philip Winchester) are recalled to 20th Division to accept a new mission. Another 20th Division agent was killed while tracking the elusive terrorist al-Zuhari in Beirut, Lebanon. Scott and Stonebridge must find out the truth. A new clue leads them to the remote jungle of Colombia - an ally of al-Zuhari is believed to be hiding in this area controlled by a powerful drug cartel. Rhona Mitra will continue to play Major Rachel Dalton this season, Michelle Lukes will play Sergeant Julia Richmond, and Liam Garrigan will play Sergeant Liam Baxter. New actors joining this season include: Robson Green plays Colonel Philip Locke; Dougray Scott plays rebellious agent James Leatherby; Milauna Jackson plays Kim Martinez, a key figure encountered by the counter-terrorism task force during the mission; Zubin Varla plays the mysterious suspicious object Leo Kamali.