In the 2290s, the Intrepid and the ISS Constellation were assigned as escorts to the deadly planet killer, which the Terrans had harnessed control of recently and were using to subjugate the Klingon Alliance. During the supposed rebellion of Captain Sulu and the crew of the ISS Excelsior, the Excelsior arrived in Klingon space under command of the counterpart universe's Captain Sulu and his crew, and found most of the territory had been devastated by the planet killer. Fortunately, Sulu was able to stop the weapon by disabling the ISS Kodos and allowing the planet killer to swallow it, depleting its power fully after it had already been significantly weakened from attacks from three K'tinga-class battlecruisers. Intrepid and Constellation took heavy damage from a combined fleet of Excelsio