Spooks – I Spy Apocalypse (2003)
The episode starts with the Spooks team locked down while undergoing a drill relating to a hypothetical terrorist attack, overseen by two Home Office officials, but as things progress it appears that there really has been an attack and a chemical weapon has been unleashed. The tension ratchets up as incoming communications show a catastrophe taking place outside, and gets worse as the boss appears to be infected, and the two Home Office officials attempt to leave, forcing Matthew Macfadyen’s character to decide between shooting them, or letting them go and risking contaminating the sealed MI5 offices. This being Spooks, it is unsurprising which one he chooses. Paul, Sheffield
