The Pegasus Replicator War was a year-long conflict in the Pegasus Galaxy, largely pitting the infighting factions of the Wraith against the suddenly-active Asurans. Spurred by the Atlantis Expedition's decision to reactivate the Ancient machines' prime directive, that being to attack and destroy the Wraith, the war quickly grew to include every living thing in the galaxy, particularly the humans whom the Replicators targeted to deprive their enemy of a food source. While incredibly destructive on both sides, the war had the effect of forcing the Wraith to begin constructing new ships and cloning more soldiers, and would ultimately pave the way for the redevelopment of the long-forgotten superhives.