Fives

CT-5555, also referred to as ARC-5555 and previously designated as CT-27-5555, was a clone trooper who served in the Grand Army of the Republic during the Clone Wars. Due to his clone designation, he was given the nickname "Fives." Originally a clone cadet during the early phase of the pan-galactic conflict between the Galactic Republic and Confederacy of Independent Systems, Fives completed his training on Kamino and attained the rank of trooper alongside his teammates in Domino Squad. As a newly-trained soldier, he was stationed in a Republic outpost on the Rishi moon at the time of a Separatist attack on the installation. As one of only two survivors, Fives was recruited into the 501st Legion. Following the successful defense of Kamino, he joined the ranks of the elite Advanced Recon Commandos along with CT-1409 ("Echo"), the only other survivor of the attack on Rishi Station.

Following the capture of Jedi General Even Piell, Fives was deployed with a team of Jedi and clones to Lola Sayu in order to rescue the imprisoned General from a facility known as the Citadel. Though the team sustained multiple casualties over the course of the mission, resulting in the death of Piell and the loss of Echo, who was presumed dead, Fives was among the survivors rescued by Jedi General Plo Koon. Later in the war, Fives served with the 501st during the Battle of Umbara. During the campaign, he played a key role in both the capture of the Umbaran airbase and the destruction of the Separatist supply ship. However, the clones ultimately discovered that their general, the Besalisk Jedi Master Pong Krell, had betrayed the Republic, deceiving his own clone troopers into fighting each other. As a result, Fives participated in their efforts to capture the fallen Jedi.

While attempting to take Ringo Vinda from the Separatists, Fives witnessed the death of Tiplar, a Jedi General executed mid-battle by CT-5385 ("Tup"). A chain of events was set in motion by the preemptive execution of Clone Protocol 66, leading Fives to discover a conspiracy involving inhibitor chips, a plot to destroy the Jedi Order, and—to an extent—Supreme Chancellor Sheev Palpatine's connection to it. After failing to assassinate Palpatine, Fives sought to warn the Jedi but was confronted by Clone Commander CC-1010 ("Fox") and a contingent of Coruscant Guard shock troopers. Although Fives was killed before he could expose the conspiracy behind the inhibitor chips, not every clone executed Order 66. At least three clones—CT-7567 ("Rex"), CC-3636 ("Wolffe"), and CC-5576-39 ("Gregor")—removed their chips prior to the activation of Order 66. As such, they did not turn against the Jedi unlike the rest of the clone army that went on to serve the Galactic Empire.