The Vor'cha-class attack cruiser is a powerful Klingon vessel that debuted in The Next Generation episode "Reunion". Its combat role is stated to be comparable to that of a heavy cruiser. The Vor'cha-class is the first new Klingon ship design portrayed outside of The Original Series era, and was designed by Rick Sternbach. The studio model for the ship was built by Greg Jein. Sternbach designed the Vor'cha-class to represent the alliance between the United Federation of Planets and the Klingon Empire by The Next Generation, and consequent technology exchange and collaboration. Thus, the nacelles of the craft were created to be similar to those on Starfleet vessels, while the color was intentionally placed as a midpoint between the dark green of the Bird of Prey and the light gray of the USS Enterprise-D. Sternbach's original concept sketches for the Vor'cha-class were sold at an auction in 2003 for US$850, while a studio model for the debris of a destroyed Vor'cha-class cruiser was sold on eBay in 2006 for US$1,025.
The design of the Vor'cha-class maintains the typical Klingon configuration with a forward module supported by a thick horizontal neck running aft and spreads out into a larger secondary hull. With a crew of 1,900 and a length of 500 meters, Vor'cha-class vessels are one of largest Klingon ships in the Star Trek universe. They are heavily armed, sporting 18 disruptor cannons as well as three photon torpedo launchers. In addition, the forward section of the cruiser is equipped with a particularly powerful disruptor beam. The ships are equipped with both warp and impulse engines, and make use of cloaking devices. In the Deep Space Nine episode "Return to Grace", the cruiser is stated to have enough firepower to threaten subterranean bases with orbital bombardments. The Vor'cha-class is frequently seen in The Next Generation and Deep Space Nine episodes depicting Klingon ships; in its earliest appearances, the class represents the flagship of the Empire, under the command of first Klingon Chancellor K'mpec and later Gowron. Later appearances use the ship as the mainstray vessel in Klingon fleet engagements.