UNIT

UNIT, also known as the Unified Intelligence Taskforce and formerly known as the United Nations Intelligence Taskforce is a fictional military organization featured in the original British science fiction television series Doctor Who as well as the 2005 Doctor Who revival series.

UNIT was a military organization that operated under the auspices of the United Nations. Its remit was to investigate and combat paranormal and extraterrestrial threats to the planet Earth. UNIT was not the only alien defense organization, but it was the one with which the Doctor had the closest personal involvement.