Sting, along with Auel Neider and Stella Loussier, are the three Extended pilots of the Earth Alliance’s special forces team, called Phantom Pain. Together with his comrades he sneaks into the PLANT colony Armory One, where he steals one of the three new Gundam-type mobile suits, the ZGMF-X24S Chaos.
He is involved in two other battles in space (the first in the debris belt, the second on the remnants of the destroyed PLANT colony Junius 7) and after the start of the Second Bloody Valentine War, Sting and the rest of Phantom Pain go to Earth. On Earth, he and his comrades engage in several battles with against the ZAFT ship Minerva, but meet with little success. Sting often fights against Athrun Zala in the ZGMF-X23S Saviour.
In an investigation of ZAFT controlled city, Diokia, Sting and his two comrades encounter Shinn Asuka and Athrun Zala for the first time with neither party realizing the other is the enemy. In the subsequent Battle of Crete, the Chaos is damaged by Kira Yamato’s ZGMF-X10A Freedom, but is quickly repaired to accompany the GFAS-X1 Destroy piloted by Stella. Stella destroys several cities in Europe until she reaches Berlin, where Sting fights against three MVF-M11C Murasame units from the Archangel and is defeated when the Chaos is cut in half.
However, he survived the battle, and is later transferred to the Earth Alliance stronghold Heaven's Base in Iceland. He pilots one of five GFAS-X1 Destroy units and defends Heaven's Base when ZAFT's Operation Ragnarok begins. Gradually losing whatever mental stability he has left during the battle, he is eventually killed by Shinn Asuka and his ZGMF-X42S Destiny, getting pierced by the Destiny's sword.
Of the three Phantom Pain Extendeds shown in Gundam SEED Destiny, Sting appears to be the most mentally stable. He actually cares for his two teammates, acting as an older brother figure. He is also the only Phantom Pain Extended to not appear to have a "block" word like Stella and Auel (if he does have one, it is never revealed). He was once considered the first Gundam pilot downed by grunt units. However, he has since lost that distinction to fellow Phantom Pain Gundam pilot Mudie Holcroft, who was downed (and, unlike Sting, killed) by grunt units shortly before the original Destroy's assault on Berlin, as chronicled in the ONA Mobile Suit Gundam SEED C.E. 73 Stargazer.