Spooks

The Grid (the team's offices) is in lockdown for an EERIE (Extreme Emergency Response Initiative Exercise) drill of a hypothetical terrorist attack in London. With Tom as the emergency executive officer, the team is told that VX nerve gas has been released and is spreading across the city, and conclude that the attack is real. The Grid loses power, and the trapped team try to make contact with the outside world. They soon exhibit signs of cabin fever, especially after they find out that Harry is infected. Some of the team believe the gas has leaked itself into the Grid, and two Home Office executives, Bridget Macy and Mark Woolley, attempt to escape. After Tom is forced to shoot them, it is revealed that the threat was a drill all along, and Tom receives top marks for his leadership skills (the guns were loaded with dummy rounds). Tom decides to break up with troublesome Vicky.