Throughout the history of Doctor Who, the Doctor has come up against many enemies and many allies. Daleks, Torchwood, Cybermen, and UNIT all have roots woven throughout the run of the show, frequently making appearances and clashing with The Doctor in one way or another.
When it comes to UNIT (short for United Nations Intelligence Taskforce), they are perhaps the Time Lord's most consistent ally over the course of the series. But what is the mysterious military operation, and what part does it play in the past and the future of the show?
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Considering the show's relationship with time travel, it should come as no surprise that the story of UNIT is told in a non-linear fashion. UNIT was brought into existence to deal with the increasing extraterrestrial encounters that Earth was experiencing. However, it was preceded by the Intrusion Counter-Measures Group, helmed by Captain Ian Gilmore. The group became involved in the Dalek civil war in the episode "Remembrance of The Daleks," a Seventh Doctor story that aired in 1988 but was set in 1963. The group, led by Gilmore with scientific advisor Dr. Rachel Jensen and her assistant Allison Williams, investigated magnetic fluctuations and became involved in the Dalek fight. Ultimately the force facilitated the evacuation of the people in the area and helped to ensure The Doctor could carry out his plan.
From this first appearance, the Intrusion Counter-Measure Group was used as a sort of proof of concept within the narrative show itself to introduce the creation of UNIT. However, UNIT had been a part of the Doctor Who mythos for many years before its origin was shown onscreen.
UNIT was officially formed in either 1969 or 1971,
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