A dangerous terrorist is on the loose and it's up to Section 20 to find him.

Reuniting for what they think is a routine "cleanup" exercise in Malaysia, Gracie Novin, Samuel Wyatt and Thomas "Mac" McAllister learn that a British operative in possession of intel about a downed Russian plane has been killed in Kuala Lumpur.

Section 20 start to close in on terrorist Omair Idrisi and his wife Jane Lowry, but the team is forced to extract devious arms dealer Morgan Ives from Libya.

As Jane Lowry surfaces in Budapest, Mac and Wyatt are forced to go undercover to infiltrate a dangerous group of white supremacists that has something she needs.

Things aren't looking good for Mac. He's blown his cover and is now facing certain death. Donovan digs into Zarin's past... and she doesn't like what she learns.

Section 20 must stop Lowry and Dr Markov from making and unleashing a deadly chemical weapon. In desperate need of intel, Novin infiltrates a drug lord's home.

Locked, loaded and set to resume their high-stakes mission, Section 20 are back. And they've got a big problem on their hands.

Damian Scott is sent to Mogadishu, Somalia to rescue British diplomats after they are kidnapped by warlord Huseyin Waabri. Meanwhile Michael Stonebridge adapts to his new career outside Section 20.

It's Section 20 vs Jane Lowry in a race to get to Omair Idrisi. It's a mission that hurls comms officer Jensen into extreme danger. Contains sexual scenes.

Watch out for a massive twist as Jensen digs into Project Tenebrae. Things don't go to plan for Mac and Wyatt as they storm a black site in search of Idrisi.

Mac's life outside of the army might seem happy, but the emotional strain of what happened in Munich starts to take a heavy toll.

Following a high-speed jungle ambush in Myanmar, the suitcase nukes end up in the hands of a brutal Rwandan drug lord with a jealous streak; Colonel Beshnov, the Russian Alpha Group leader, surprises Pavel with a revelation about Zarkova.

An Indian general decides to hold off on the assault on a New Delhi hotel that has been under siege when he learns that Scott and Stoneridge are in the hotel and they have ID'd the weapons scientist known as Mahmood.

Scott and Stonebridge head to Chechnya to track down Latif and a stockpile of chemical weapons.

Scott and Stonebridge track down a radical Islamic cleric in order to recover the nuclear devices, but are sidetracked by a CIA air strike and hostile locals.

Stonebridge seeks revenge on Craig Hanson after he turns up in Cape Town, South Africa. Meanwhile, Scott reconnects with a Mossad agent who's been following their case, but with a different set of orders; Knox hustles Evans to a secret installation and explains how he intends to turn his country into a world power.

An MI6 agent called John Allen ends up takeing Stonebridge and Scott from Vienna on a dangerous mission to Kosovo.

British sergeant Michael Stonebridge recruits help from Ex-Delta Force operative Damien Scott when an agent named John Porter is kidnapped by a Pakistani terrorist. The two then uncover clues to a possible terrorist attack at a New Delhi hotel and they race there to foil it.

Scott manages to pass Connolly's explosive test and works on bypassing a security code. Bratton contacts Marshall.

The trail of the missing nuclear triggers leads to Cape Town, South Africa, where kidnappers abduct the children of an expatriate munitions expert to force him to cooperate.

Scott and Stonebridge prepare for an attack by Al Qaeda while holed up in an Algerian farmhouse with the nomad leader and the wounded courier. Meanwhile, back at headquarters, Dalton is called on the carpet for her relationship with the courier.

Section 20 are desperate to clear their names. And to do so, they hatch a big and wreckless plan.

Knox extricates a political leader from a Zimbabwe prison, and the unit tries to catch up with the escapee by tracking his activist daughter.

In Kosovo, Stonebridge, Scott and four hostages find themselves in dire straits after being double-crossed by KFOR soldiers and the drug lord Hasani.

Collinson sends Porter undercover to Zimbabwe on a mission to break a former British soldier who was involved in a political assassination out of a high-security Harare jail.