The team are called out to a major operation, where events take a worrying turn.

We rejoin the Bluestone 42 team after the IED explosion has hit their mastiff.

Simon's lack of trust in Mac and Rocket comes back to bite him.

Nick regrets showing off to his new number 2, Towerblock. Simon and Bird come to blows.

Nick and Simon help each other to learn to dance. Bird is revealed to be a terrible flirt.

A blast from the past knocks Nick off his game. Bird tries to teach Mary a lesson.

Bird hatches a plan to stop Nick and Mary going on about each other once and for all.

A mortar attack on the patrol base sends Bluestone 42 diving for cover.

Ellen has to learn to bend the rules, while Mac and Rocket do gladiatorial combat.

As the team prepare to leave Afghanistan for good, Simon receives some devastating news.

Nick and the Lt Colonel find themselves in a battle of wills. Rocket gets a pet rat.

The team gets a visit from a government minister, to whom Mary unexpectedly takes a shine.

The team suffer a Taliban attack, which distracts Ellen and Bird from their bickering.

Bluestone 42 join a midnight raid on a bomb factory and rescue a kidnapped aid worker.

Towerblock is put through his paces after challenging Rocket to a battle of the fittest.

The team experience a tough roadside ops, whilst Mary grabs the attention of Nick.

Mary reveals a secret about her past. Bird is offered a promotion.

Nick faces a challenge with a booby-trapped car bomb. Simon stands up to his fiancée.

Nick is desperate to find some decent food to use in an attempt to seduce Mary.

Simon tries to earn respect by joining in dangerous homemade games with Mac and Rocket.