One of the Delta Quadrant peoples who ended a long regional war and joined the Antarian Trans-stellar Rally of 2377, in which the Terrellian pilot Irina secretly tried to wreck the new peace.
The Terrellians are a humanoid species from a region of the Delta Quadrant that had been at war for almost a century. A recent treaty ended the fighting, and the former enemies agreed to hold the Antarian Trans-stellar Rally, a sublight race, to celebrate it.
In the episode Drive, Tom Paris enters the Delta Flyer in the rally after meeting the Terrellian pilot Irina. When her co-pilot Joxom is hurt in an explosion aboard her ship, Harry Kim volunteers to fly with her.
Kim discovers that Irina staged the accident herself and has rigged the Delta Flyer's warp core to explode at the finish line, hoping the deaths would restart the war. Paris and B'Elanna Torres eject the core in time, and Irina's plot is exposed.