The Army of Tempus is a legion of ghosts led by Tempus in an alternate future.
In an alternate timeline, on July 30th, 1997, Tempus killed Egon Spengler and released all ghosts from the Containment Unit. The Great Spirit Uprising had begun. In years, the Army of Tempus conquered the world and enslaved all of humanity. In the following era, the army was delegated to rounding up remaining humans. Tempus summoned his army when a time lost Kylie Griffin attempted to help re-write history.