Star Trek / Green Lantern #1

Synopsis

Six months after the Spectrum War, Guy, John, and Kilowog are adjusting to life on 23rd Century Earth, while Hal and Carol accompany the Enterprise on missions. All of the Lanterns rings were super-charged by Ganthet when transporting them to this universe, but now the rings intermittently power down without warning, endangering the lives of the ring-bearers. The Enterprise tries to track down Saint Walker, who disappeared while on a mission exploring the Beta Quadrant, unaware that he has been captured by Klingon forces and brought to the new emperor of the Klingon Empire, Sinestro!