Black Star Dragon Ball SagaEdit
Trunks in Dragon Ball GT.In GT,Trunks goes on a journey with Goku and Pan in a space ship designed by Bulma. Later, a piece of the ship falls off and Goku, Trunks, and Pan are forced to crash land on the planet Immecka to get the parts needed to repair the ship. Groups of merchants then swarm Trunks and the others to the point that they take refuge from them in the Gold Star Hotel. They then realize they are being charged every second for everything in the hotel. They escape without paying and stumble upon the house of an old couple and their children. They talk about Don Kee the ruler of the planet and how he mistreats his rule, just then Don Kee's men come and repossess the old couple's house saying they where behind payment. Goku suggests that they go and fight Don Kee but the couple says that is impossible because of his grand army. On their way back to the ship Trunks drops the Dragon Radar and it is swallowed by the small robot T-2006 nicknamed Giru who says that he can't give the radar back to them because it is already integrated into his system. Trunks as a Super Saiyan in GT.Meanwhile Goku notices the ship being dragged away by Don Kee's men. He tries to use Instant Transmission to teleport them to the ship but after two failed attempts realizes that he can't use it in his small body. They are forced to travel to Don Kee's palace on foot to recover their ship. Pan decides that they will use a stealth operation to recover the ship and would only result to fighting as a last resort. After briefly sneaking around a large rock falls on Trunks' head and Giru starts making noises that alarm the guards. The guards open fire on the group. Pan jumps in the carrying car while Goku moves the ship onto the car and Pan drives the ship out of the palace with Goku and Trunks. But while escaping, Don Kee's henchmen Gale and Sheila fire a ki blast at Goku who reflects it back with ease towards Ledgic Don Kee's right hand man who recognizes them as Saiyans.
Goku and the others escape but Trunks says they have to go back into town for more more parts due to Pan's "reckless driving". Once they reach the town everyone hides and Trunks finds the three of them on Immecka's most wanted list. While running from Don Kee's men they fall into the house of a nice old couple who offer them food after realizing Goku and company mean no harm. They say that Don Kee made it a law that no one is allowed to own a ship so that no one would escape the planet including the old couple. Pan gets fed up and convinces Goku and Trunks to go face Don Kee head on. They turn themselves in to the police and get brought to the palace. Once there Goku and Trunks and Pan incapacitate Gale, Sheila, and all of Don Kee's guards. Then Goku blasts his way into Don Kee's throne-room. Don Kee sicks Ledgic on the fighters after capturing Pan in an energy chamber. Ledgic says that he will fight Goku but for his own satisfaction. After a short fight Goku defeats Ledgic and they take down Don Kee and make him give everyone free rent and give them back their ships free of charge. Plus Don Kee gives them the parts they need for free and they leave Immecka.
They then land on an unnamed planet where everything is larger than life. They finds the Four Star Ball in the tooth of a giant and they go to the next planet. On planet Gelbo they find the Six Star Ball in the hair of the princess of the village, Leing. Trunks asks for the ball but her finance Doma said that they where in a large problem already. The amphibian creature Zoonama was threatening the village with earthquakes and volcanoes if they didn't give him Leing. Goku decides that he would help them out in exchange for the Dragon Ball and they agree. Pan comes up with the idea to disguise Trunks as Leing. Zoonama comes and takes Trunks to his lair. Trunks gets Zoonama tipsy and Goku arrives with Pan and Doma. Doma cuts off Zoonama's left whisker with a huge pair of scissors and as he cuts off the left one Zoonama awakens in a drunken rage. He begins to wiggle his whiskers and an earthquake begins to come but stops soon after while Zoonama continues to wiggle his whisker. Pan realizes that he can't cause earthquakes only predict them but now he is so tipsy that he didn't realize that the quake was over. Suddenly a really big earthquake erupts and Goku and the others leave the cavern with Zoonama. Goku then stops the huge volcano with a Kamehameha wave saving the city and winning the Dragon Ball. Just as he goes to get the ball the mysterious Para brothers arrive and take it.Trunks then jumps in the ship with Pan and Goku and they chase after the Para brothers. The brothers trick them onto the asteroid of Beehay inhabited by huge bloodthirsty worm-like creatures called Mouma. The Para brothers escape and fly to the planet Luud. They go to Cardinal Mutchy Mutchy who tells them that they have failed and that Trunks has another Dragon Ball on his ship that they failed to get and they must go retrieve it. They travel back to find Goku and the others and they get hypnotized by the Para brothers until they are saved by the hungry Mouma. Pan goes aboard Para's ship to find the Dragon Ball that they stole. She accidentally activates the auto-pilot and is brought to Luud. There she is captured and turned into a doll for the evil lord Dolltaki. Goku shows up with Trunks and kills Cardinal Mutchy Mutchy who reveals that he is actually two parts, the body and the whip which transforms into Mutchy and fights Goku. Trunks finishes Mutchy off with the Flash Bang attack and saves Goku from Mutchy's whip-like arms.
Then Dolltaki turns everyone except for Trunks, Himself, Goku, and Pan into dolls and feeds them to the machine deity Luud. Dolltaki then awakens Luud who takes him and Pan inside of Luud's body to gain their energy. While Luud fights Goku and Trunks Pan forces Dolltaki to tell her the weakness of the seemingly invincible Luud. Dolltaki reveals that Goku must strike the outside of Luud's mechanical heart while Pan strikes the inside at the exact same time. After multiple tries Goku and Pan finally succeed and destroyed Luud freeing all of the people. Trunks then takes back his Dragon Ball and they leave the planet.
 Baby SagaEdit
Trunks under Baby's control.In the Baby saga, Baby possesses him but seems to be driven out by Trunks' power, when Baby possessed Trunks he turned Super Saiyan and removed Baby from his body, when in fact Baby only wanted to place an egg in him, to be later activated on Earth. As a servant of Baby, Trunks helps to power him up to defeat Goku on Earth. On the reconstituted New Planet Plant, he, Goten, and Gohan try to save their new lord from Uub, who seems to overpower him. However, Baby was just playing with Uub, and blasts his slaves into unconsciousness for their interference. Trunks is the first to be cured by the Sacred Water, and after being cured, he along with Gohan and Goten help to restore the energy of Super Saiyan 4 Goku so that he can finish off Baby. Trunks appears to have inherited his mother's fascination with technology. He gets distracted by the gadgets on the hospital planet, allowing Baby to sneak up on him. This turns out to have been a plan to lure the villain into a trap however, as Goku, Trunks, and Pan could sense Baby's ki when he got excited about hunting them.
 Super 17 SagaEdit
A year later, Trunks observes the 30th World Martial Arts Tournament, due to the fact that it was too late for him to compete.
A month later, Trunks is ambushed by a brainwashed Android #17. Trunks joins up with Goten, Majuub, Pan, Gohan and Vegeta to fight countless villains who have escaped from Hell. Trunks, then joins the fight against Super 17 but is unable to defeat him even with the help of Gohan, Goten, Majuub, and his father.
 Shadow Dragon SagaEdit
Later against Syn Shenron he tries to restore Goku's energy once again along with Goten and Gohan. After the dragon transforms into Omega Shenron and Super Saiyan 4 Vegeta suggests he and Goku fuse to defeat him, Trunks along with Gohan, Goten and Majuub tries to hold of Omega long enough for Goku and Vegeta to fuse. They are successful and Goku and Vegeta form Gogeta.
Later on when Goku is presumed dead by Omega Shenron, Vegeta decides the earth's best bet is for him to try and defeat Omega Shenron while everyone else escapes. Before sending them off, Vegeta requests that Goten, Gohan, Trunks continue the fight if he fails. The three half-Saiyans say goodbye to their families and decide to go back to help Vegeta in the fight but they are all easily defeated. However they do succeed in distracting Omega long enough for Goku to charge his Universal Spirit Bomb which destroys the Shadow Dragon.
Trunks is last seen telling Pan that the Dragon Balls will come back after the Earthlings have proven they can take care without them.