A Kohm villager on Omega IV who serves Captain Ronald Tracey in 2268 and whose claim to be 462 years old convinces Tracey the planet holds the secret of immortality.
Wu appears in the second-season episode The Omega Glory. The Kohms are the settled people of Omega IV, at war with the wild Yangs, and Tracey of the USS Exeter has broken the Prime Directive by defending their village with his phaser.
Wu acts as Tracey's lieutenant among the villagers and leads the guards who hold Kirk's party. Tracey presents him as proof of his great discovery. Wu looks like a man in middle age, yet he states calmly that he has seen forty-two years of the red bird, which comes once in eleven years, and that his father is older than a thousand.
McCoy's tests show that the long life is the result of natural selection after an ancient biological war, and that nothing can be bottled. Wu was played by Lloyd Kino.