SecondGen Cyan-Gray was a second generation Sentry.

In 2381, Cyan-Gray attempted to recover the wreckage from SecondGen White-Blue's shipframe when it saw the USS Titan there and engaged it. This battle caused major damage to the Titan which Cyan-Gray was determined to fix after it was informed by White-Blue to stop its attack. Cyan-Gray then towed Titan back to the Sentry's home system and began repairs. Later, Cyan-Gray would be rescued by Titan during a battle with the Null. (TTN novel: Synthesis)