Following the broadcast of the 2005 Doctor Who series, executive producer Russell T Davies claimed that the UN were no longer happy to be associated with the fictional organisation, and the UN's full name could now no longer be used.

Brigadier Alistair Lethbridge-Stewart Captain Mike Yates Corporal / Sergeant / WO1 John Benton The Doctor Dr.

Elizabeth Shaw Jo Grant Sarah Jane Smith Lieutenant Harry Sullivan Brigadier Winifred Bambera Dr. Mace General Sanchez Captain Erisa Magambo Colonel Oduya Kate Stewart Jac Petronella Osgood UNIT, or Unified Intelligence Taskforce (formerly United Nations Intelligence Taskforce) is a fictional military organisation from the British science fiction television series Doctor Who, Torchwood, and The Sarah Jane Adventures.

Operating under the auspices of the United Nations, its purpose is to investigate and combat paranormal and extraterrestrial threats to the Earth.

In the original Doctor Who series, several UNIT personnel (such as the Brigadier) played a major role in the programme.

In a series of interviews originally recorded for the 2006 DVD of the Doctor Who serial Inferno (1970), actor Nicholas Courtney, who played Brigadier Lethbridge-Stewart in The Invasion, similarly described The Invasion as a "dummy run" for the idea of the Doctor, the main protagonist of Doctor Who, being exiled to Earth.

Dicks also said that the idea of exiling the Doctor was done because making every serial take place on Earth was cheaper to produce than if every serial had to have a new alien planet built, and that UNIT was an idea Sherwin had come up with to answer the question of what to do with the Doctor after he was exiled to Earth.Speaking in an interview on the 2012 DVD of the Doctor Who serial The Krotons (1968–69), Sherwin said that he wanted Doctor Who to be "down on Earth anyway, for credibility", and described UNIT as "the ideal vehicle" for this.In another 2014 interview in Doctor Who Magazine, Sherwin recalled that after submitting his scripts for The Invasion to Bryant, which included UNIT, Sherwin, who was also working freelance as a script editor, was told by Bryant to introduce his UNIT idea earlier, as it could "take some of the weight off [the] shoulders" of actor Patrick Troughton, who played the Doctor.Speaking in an interview on the 2011 special edition DVD of Spearhead from Space, Sherwin claimed that he had created UNIT because he wanted to give some "considerable support" to the Doctor, "so that [Troughton] didn't have so many damn lines to learn each week".Sherwin told Doctor Who Magazine in 2014 that while working as script editor on the Doctor Who serial The Web of Fear (1968), which also involved an army, he told scriptwriters Mervyn Haisman and Henry Lincoln to include all of the characters that he had originally invented for The Invasion.Sherwin was uncertain if the army forces featured in The Web of Fear appeared as UNIT, but was "convinced" that, as a teaser for UNIT's more substantial role in The Invasion, The Web of Fear was supposed to have replaced the basic army forces that were seen in the story.