Spooks, Agenda

Adam returns to work when multiple terrorist attacks plunge Britain into chaos - and it seems there could be an enemy within.

Harry races to prevent Britain being turned into a dictatorship as the conspirators exert their control over the Prime Minister, but is taken prisoner.

Zaf goes undercover to infiltrate an al-Qaeda cell planning a bomb attack, while Adam tries to stop the terrorists reaching their target.

Team members unearth an assassination plot when they are posted undercover at the heart of the World Trade Summit for Africa.

Harry suspects foul play when a group of terror suspects are killed in an alleged accidental prison fire, but fails to act and a member of his team is framed for their murder.

Adam and Zaf track down an elite team of terrorists that has entered Britain, while Ros safeguards a group of Saudi princes.

The terrorists demand the release of al-Qaeda prisoners in Saudi Arabia and resort to killing the hostages when the government refuses to negotiate.

The team is given cause for concern when a Muslim cleric is killed by an assassin apparently fighting in the name of extremist Christianity.

Adam is approached by his treacherous former partner, who asks for his help when the team are assigned to protect a high-profile witness.

Adam and Ros try to negotiate with a group of environmental terrorists threatening to flood London unless the Government release a secret document.