Powerful in the Force, before his third birthday he helped defend the Jedi Academy from the spirit of the Dark Lord Exar Kun. Kun sent ancient flying beasts to attack my near- lifeless body, and Jacen wielded my lightsaber to defend me. Later, Jacen joined forces with the Jedi students to destroy Kun's spirit forever and reunited my spirit and body.

When he was 5, he, Jaina, and their younger brother, Anakin, were kidnapped by Lord Hethrir, the former Imperial Procurator of Justice, who wanted to use them to further his own Dark Side ambitions. While his captives, they befriended the Chironian girl, Lusa, who would later come to study at the Academy. The twins enrolled at the Jedi Academy at the age of 13 and became fast friends with Chewbacca's nephew, Lowbacca, and Tenel Ka, the daughter of Teneniel Djo of Dathomir and Prince Isolder of Hapes. The twins and Lowie were at one point kidnapped by the Shadow Academy, where an unsuccessful attempt was made by my former student, Brakiss, to turn them to the Dark Side, even going so far as tricking the twins into fighting each other with lightsabers. Though they managed to get away, the Second Imperium found a willing replacement in their old friend Zekk, whom Brakiss convinced to join the Shadow Academy and become its Darkest Knight.

With the threat of the Shadow Academy looming over all our heads, I felt it necessary for the twins and their friends to construct their own lightsabers. They were more than excited at this prospect, though Jacen was a little nervous due to Brakiss's manipulation. He used a corusca gem for his saber that he found while visiting Lando at his GemDiver Station in the gas-giant Yavin. Meanwhile, Tenel Ka, feeling that the tool was insignificant compared to the user, hastily built her saber with faulty components. While Jacen and Tenel Ka were sparring, her lightsaber shorted out, and Jacen's blade cut off her left arm below the elbow. We were all shaken by this shocking event, but none more so, I think, than Jacen.

The young Jedi forged ahead, however. Investigating the disappearance of Bornan Thul, the father of fellow Jedi student Raynar Thul, led them to the Diversity Alliance, an anti-human group led by the female Twi'lek Nolaa Tarkona. Tarkona was hunting for a storehouse of diseases, one of which could kill every human in the galaxy. The twins were tipped off by their friend Lusa, who had fallen in with the Alliance but escaped. The twins managed to stop the devious plot, but at the loss of Bornan Thul. They then went on to stop the civil war on the planet Anobis, home planet of their new friend, Anja Gallandro. She was a lackey of Black Sun's newest leader, Czethros, an old "friend" of Han Solo's, who ordered her to kill his children. After she learned that Solo didn't kill her father as previously suspected and that Czethros was minuplating her, she turned on him. Jacen had a slight crush on Anja, I think, and was sorry to see her go off to work for Lando.

I took Jacen and Anakin on as my apprentices after their graduation from the Academy. The brothers seemed to be growing increasingly divergent in their respective beliefs in the Force. Anakin believed that it should be used to its fullest extent, while Jacen saw it as a personal entity and that Jedi should remove themselves from the galaxy at large. His personal beliefs aside, Jacen can be quite impulsive at times. Shortly after the invasion by the Yuuzhan Vong began, Jacen and Jaina launched a plan to reconnoiter the Vong baseworld of Helska IV. Jaina acted as pilot, while Jacen drove a mole miner into the planet. There he witnessed the brutal death of Jedi Knight Miko Reglia and helped save the ExGal scientist Danni Quee. Jacen has been on the front line often during the Vong invasion. He fought at Dantooine, holding back Chazrach footsoldiers; participated in a recon mission with Corran Horn and Ganner Rhysode; defended the planet Ithor. At Ithor, the Jedi underwent a cleansing ritual by the Ithorian priest so that they could step on the sacred soil. Each Jedi had to admit and confront a personal fault; Jacen's was his constant need to know what the future holds. I hope that Jacen keeps this in mind during the trials ahead, and remembers his capture by the Vong during our recon mission to Belkadan, where he tried to make a supposed Force vision come true. He is at a precarious point in his development as a Jedi. His disagreement with Anakin on the essential nature of the Force and what constitutes crossing to the Dark Side may have caused the inadvertant destruction of 3/4 of the Hapan fleet at Fondor when Centerpoint Station was fired. I hope Jacen remembers to look for the forest as well as the trees.

Though Jacen is conflicted over how to use his powers in the Force, he still wants to do good. For a while he flew on the Millennium Falcon with his parents, cutting off Vong supply and slave routes. He was just as conflicted about attacking the Vong in this respect as he was in using his Force-powers. Thankfully though, he settled his differences with his father and continues to do his part in the war effort. He volunteered to go with the strike team that went to Myrkr to destroy the voxyn queen, the creature that was cloned into a hoard of Jedi-hunting death machines. Jacen's ability to unite the team in a kind of battle-mind kept the operation running smoothly for awhile. However, it wasn't enough to keep all the Jedi alive on the mission. Among others to fall to the Vong was his own brother Anakin. In Jacen's defense, even with this crushing blow to the team's spirit as well as his own personal loss, Jacen managed to destroy the voxyn queen. However, he was captured in the process.