Section 20 is an elite covert British military intelligence and counter-terrorism unit originally formed within the Secret Intelligence Service. They are responsible for travelling around the world covertly to neutralise terrorist threats that are aimed at the United Kingdom. The unit has equipment that is fully mobile, enabling them to respond to threats quickly as soon as they rise.
Focusing on high-risk and top-priority targets, the unit is capable of moving from country to country anywhere in the world, sometimes covertly, sometimes with the agreement of the government. Section 20 operates as a highly sophisticated mobile intelligence unit.
- Season 1: Hugh Collinson - Deceased
- Season 2: Eleanor Grant - Deceased
- Season 3/4: Rachel Dalton - Deceased
- Season 4: Philip Locke - Alive