The Pegasus Project

SG-1 visits Atlantis with two goals: to find new clues about the location of Merlin's superweapon and to disable the Supergate by connecting it to a black hole. As McKay assists SG-1 in their elaborate plan to "jump" a wormhole into the Supergate, Daniel and Vala search the city's database for information, eventually confronting the Ancient known as Morgan Le Fey.