Voyager becomes trapped in orbit of a primitive planet where time passes rapidly (days are seconds aboard the ship) and enters the mythos of its indigenous people. Inadvertently influencing the civilization, Voyager eventually becomes the target of newfound weaponry. 

The crew of Voyager experience vivid memories and dreams of a battle they don't remember having, with an enemy they have never encountered. Captain Janeway worries about crew members suffering from post-traumatic stress disorders after Chakotay, Neelix, Kim, and Paris return from an exploration.