A race of aliens encountered by the crew of the USS Voyager,they live in the region on space where there are no stars or systems.The Night Aliens are being infected by toxic chemicals that are being dumped into their space by the Malon.
The Malon are using a wormhole to get to their space and back.The Night Aliens and the Voyager crew work together to stop the Malon and Voyager enters the wormhole and destroys it,saving the Night Aliens from more pollution of their space. (VOY": "Night")