Jax was a member of the Clone Youth Brigade aboard the Venator-class Star Destroyer Endurance. After he and the other clone cadets were given a briefing on battle ways, he offered Boba Fett, who was disguising himself as a clone named "Lucky", his assistance when the other clone youths were picking on him, but Fett insisted that he could handle himself. Jax agreed, stating that they were all in it together. As time went on, Jax befriended Boba Fett, unaware that Fett was secretly attempting to kill Mace Windu for the death of his father, infamous bounty hunter Jango Fett at the Battle of Geonosis, the first battle of the Clone Wars. He aided in the evacuation of the Endurance when the ships hall was damaged by Fett. Fett secretly damaged their escape pod so they would miss the rendezvous p