The primitive humanoid inhabitants of the planet Nibiru, whom Kirk's Enterprise saved from a volcanic eruption in 2259 at the cost of exposing the starship to them and violating the Prime Directive.
The Nibirans appear in the opening sequence of Star Trek Into Darkness. They are a tribal people with chalk-white skin and dark eyes, wrapped in yellow cloth, living in a forest of red vegetation beneath an active volcano that threatens to wipe them out.
Kirk and McCoy steal a sacred scroll from their temple to lure the tribe away from the mountain, then flee and leap from a cliff into the sea, where the Enterprise is hidden. Meanwhile Spock is lowered into the crater with a device to freeze the lava and becomes stranded.
To beam him out, Kirk raises the ship from the ocean in full view of the Nibirans. They abandon their scroll and begin drawing the shape of the Enterprise in the dirt. Spock's honest report of the incident costs Kirk his command, briefly.