The Invasion, Part Two

The Doctor and Jamie are rescued from the clutches of Tobias Vaughan by soldiers assigned to the United Nation Intelligence Taskforce (UNIT), which is commanded by Brigadier Lethbridge-Stewart, an old friend from the Yeti incident in the London Underground. The newly promoted Brigadier informs the Doctor that both the British government and the United Nations share his suspicions about IE and are adamant to prevent Vaughan's plan, whatever it may be, from coming to fruition.