The N'Kai are an alien species that has existed since before the Earth formed 4.5 billion years ago. Currently, they are fighting a losing war against the (Gargoyles) Space-Spawnn Another alien race is also involved in this war. Their war has lasted for many centuries, and they have positioned Sentinels on various worlds to watch for Space-Spawn invasions of those planets. The only known member of this species is Nokkar, who appeared in the episode "Sentinal".