The crew experiences vivid nightmares, all containing the same mysterious alien. Chakotay must stay awake to lead an attack against a species that lives in the dreams of Voyager's crew.

After contacting Starfleet Command using the alien relay modules to communicate with Earth, Starfleet replies with letters from the crew's friends and family. Using of the alien array attracts the attention of the Hirogen, an alien species that live to hunt other humanoids.