Part I: Voyager receives a distress call from an Hirogen training facility, only to find the advanced holograms used as prey in their combat simulations have achieved sentience and intend to wage war against all organic life. Part II: The Doctor's loyalties to his holographic brethren are tested to the limit as the megalomaniacal tendencies of the rebel holograms' leader, Iden, continue to manifest during the voyage toward a Class Y planet on which they intend to build their own society.