In the Star Trek: Voyager episode "" (Season 3, Episode 24), the crew faces a unique tactical threat when they are systematically replaced by members of an alien race called the Nyrians . Mission Summary
: The Nyrian device uses a long-range transporter variant that swaps matter between two locations. It was neutralized by B'Elanna Torres and Kim once they identified the frequency of the Nyrian pulses. [S3E24] Displaced
: The Nyrians use displacement technology to seize ships without traditional combat, moving original crews into "habitats" tailored to their physiology to keep them docile and comfortable. In the Star Trek: Voyager episode "" (Season
The crisis begins when a Nyrian named Jarlath suddenly appears on Voyager , while Chief Helmsman Tom Paris simultaneously disappears. This "displacement" continues at 10-minute intervals, with a crew member being swapped for a Nyrian until the entire Starfleet crew is transferred to a massive Nyrian habitat. Key Observations : The Nyrians use displacement technology to seize