The Negh'Var-class Klingon cruiser was based on the Vor'cha ships first seen in "Reunion" in Star Trek: The Next Generation. The Negh'Var-class ship has more weapons, upgraded engines, and generally looks more threatening. It was originally intended only to be used in the future scenes of "All Good Things..." in Star Trek: The Next Generation, but due to its wide appeal it showed up in the Dominion War on Star Trek: Deep Space Nine.