Filling in the gaps that fans of the series demanded, this Who special episode explores the character of Brigadier Lethbridge-Stewart. Doctor Who (Patrick Troughton) and his team go to International Electromatics in search of a missing scientist. The Brigadier's UNIT force aids the Doctor in discovering what lies under the surface of International Electromatics and what exactly it's nefarious leader, Tobias Vaughn, is up to.