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|Also called:||British Security Service, Secret Service|
|Leader:||Veronica Halliwell, Michael Hanson|
|Notable members:||Dekker, Harry Sullivan, Margaret Blaine|
20th century Edit
Major Wheatley worked for MI5 during World War II. He became concerned for Winston Churchill's mental health after he saw a large black dog on an evening walk. He later arrested the Tenth Doctor as a Nazi spy. (AUDIO: Hounded)
Veronica Halliwell was the head of MI5 in 1997. She was ordered to shut down a publishing company which had released an exposé on UNIT. (PROSE: The Dying Days) The following year, Halliwell was assassinated by the Voracians. Her death was investigated by Harry Sullivan, now Deputy Director of the organisation. Michael Hanson, the acting director, had been modified into a cyborg by the Voracians to serve as their agent. (PROSE: System Shock) In 1999, Harry Sullivan still remained in the organisation. (PROSE: Millennium Shock)
21st century Edit
When the 456 contacted the British government again in September 2009, Floor 13 of Thames House, served as the location of a 456 ambassador transported to Earth for negotiations. (TV: Children of Earth: Day Four) When Jack Harkness announced that humanity would fight, the ambassador released a virus into the air of Thames House, now hermetically sealed electronically so that the virus could not escape. Many, if not all, of MI5 in the building died from the virus. (TV: Children of Earth: Day Five)