Stargate Atlantis: The Daedalus Variations

A copy of the Daedalus appears in orbit over the Atlantis, and the crew boards the vessel to investigate, only to be greeted by a chilling message from the ship's former captain. McKay's attempt to unravel the mystery is thwarted when the derelict ship is hurled into an alternate reality, where the team faces an alien armada and the heat of an expanding sun - threatening any chance of returning home