The Kellidians were a species native to the Delta Quadrant.

On stardate 53317.1, Kathryn Janeway, captain of the USS Voyager, was abducted by the Kellidians, although she was later rescued by Lieutenant Commander Tuvok, Voyager's chief tactical officer. (VOY: "Endgame")

The stardate given would place this event between the episodes "One Small Step" and "The Voyager Conspiracy".