Chaoyang Soo was a 23rd century Human male. By the mid-2260s, Soo was serving as a sciences division lieutenant, junior grade in Starfleet, assigned as a junior science officer aboard the USS Constellation. Prior to his assignment aboard the Constellation, Soo had studied several languages, including English, French and Mandarin, and at least had the ability to count to ten in each. Soo presumably perished with the rest of the Constellation crew in 2267 during the encounter with an ancient "planet killer" depicted in TOS episode: "The Doomsday Machine".