Doctor Who: The Gold Archive: Invasions of Earth: A Secret History

The narrative reveals the hidden history of the Unified Intelligence Taskforce (UNIT), detailing its crucial role in protecting Earth from alien threats over the past fifty years. It chronicles the organization's evolution from its early days under Brigadier Lethbridge-Stewart to its current leadership by his daughter, Kate. The account includes declassified files, technical schematics, and firsthand testimonies from UNIT personnel, alongside insights from the Fifteenth Doctor, making it a comprehensive guide to humanity's battles against extraterrestrial invasions.