The Nihydron were a spacefaring species in the Delta Quadrant native to a region of space near the Krenim Imperium.
In one possible timeline in 2374, three Nihydron warships joined the USS Voyager in its attack on the Krenim weapon ship. B'Elanna Torres and Harry Kim were assigned to work with the Nihydron to implement temporal shielding aboard their ships. (VOY: "Year of Hell, Part II")
- The current state of the Nihydron Empire is unknown, after the temporal weapon ship was erased from time, undoing all the damage it had done.Species 10026 ships shown in "Dark Frontier" are identical to the Nihydron ships shown in "Year of Hell".