X2 was a Force-sensitive clone trooper secretly created by the Kaminoans prior to the outbreak of the Clone Wars. Cloned from the DNA sample of the Jedi Knight Falon Grey, X2 participated in the war, fighting for the Galactic Republic alongside his brother X1, created from the same genetic sample. The two fought in many battles of the Clone Wars, earning the reputation of valuable and skilled soldiers. During the final days of the war, X2 participated in the Battle of Cato Neimoidia, where he was ordered to kill his commander, Jedi Master Ferroda, when Order 66 was issued by Supreme Chancellor Palpatine. X2 complied, killed Ferroda, and entered the ranks of the stormtroopers, serving the newly formed Galactic Empire; however, he, unlike X1, was uncertain about this choice. After months of service to the New Order, X2's doubts intensified greatly during an attack to kill a fugitive Jedi taking shelter among simple villagers on the planet Dantooine. After learning that X1 was planning to kill innocent people who were hiding the Jedi, X2 defected from the Empire.

Siding with the Jedi—who turned out to be his "father," Falon Grey—he tried to help the civilians get off-planet, but X1 caught up with them and killed everyone except X2, who survived only because Grey managed to Force-heal him before dying himself. X2 spent the following fifteen years on Dantooine working as a simple farmer until he was discovered by Grey's former Master, Rahm Kota, and was recruited by him into the Alliance to Restore the Republic. Soon after becoming a member of the Rebellion, X2 rescued a captured group of Rebels on the planet Geonosis, and they pledged their allegiance to him. On Kota's advice, X2 assembled the men into a military unit, christening it Grey Squadron in honor of Falon Grey. X2 and his men proved to be a valuable asset to the Rebellion, participating in many engagements throughout the Galactic Civil War, including the crucial Battles of Yavin, Hoth—during which X2 faced off against X1, who was still serving the Empire—and Endor. During this time, X2 also began to explore his Force-sensitivity, guided by Rebel Jedi Luke Skywalker.

After the Battle of Endor and the death of Emperor Palpatine, X2 was elevated to the rank of Jedi Knight by Skywalker and was given a lightsaber by him. Knowing that X1 was still roaming the galaxy, trying to rebuild the Empire—which had become fragmented in the aftermath of Palpatine's death—X2 vowed to find and stop him. Eventually, X2 tracked his brother down to the planet Mustafar, where the latter clone, having captured Skywalker, planned to create an army of Force-sensitive clones from Skywalker's DNA. X2 faced off against X1 and defeated him in a lightsaber duel, though he refused to kill him. In response, X1 tried to kill X2 with his lightsaber by manipulating it with the Force, but X2 quickly reacted and jumped out of the way of the lightsaber, leaving X1 to be stabbed by his own weapon and to fall into the fiery lava below. After the battle, the rescued Skywalker promoted X2 to Jedi Master. (Read more…)