Although the Sith lord's appearance onscreen midway through Rogue One: A Star Wars Story was written into the script from the get-go, his most incredible scene came at the very end: an intense hallway battle sequence in which a besieged ship full of rebels raced to escape with their stolen blueprints for the Death Star while Darth Vader advanced on them, lightsaber in hand, cutting down every last man with casual brutality. It's an incredible moment, made that much more remarkable by the fact that it was tacked on at the last possible moment after the Rogue One editor argued Vader needed more screentime.
"We were cutting the film together and my editor, Jabez Olsson, he said, 'I think you need to see one last moment with Darth Vader,' like one more bad-ass moment with him," director Gareth Edwards explained. But the timeline was extraordinarily tight; said Edwards, "When he mentioned this, it was about four months maybe from release." Ultimately, the sequence was shot in three days—an incredible feat for a last-minute edit that ended up being among the best and most memorable scenes in the entire film.