Dragon Ball Z : Bojack Unbound

Bojack is the main villain of the movie. His goal is to conquer the universe and destroy all those that stand in his way. According to King Kai, he was sealed by all four Kais in a star, but when Goku teleported the devolved, ready to self-destruct Cell to King Kai's planet, killing him, the seal broke, allowing Bojack to be free to do his destruction upon the Earth.

Having another World Martial Arts Tournament funded by Mr. X.S. Cash for his son's birthday, Hercule invites everyone on Earth to a competition on Battle Island. Charging through the preliminaries with no trouble, Krillin, Piccolo, Trunks, Gohan and Dosqoi, an ordinary human, advance to the Semifinals. In the first round Gohan wins with ease. The second round between Trunks and Tien began. Tien gave the audience a "good show" by using his Tri-Beam Cannon, and the two took to the air after a quick warm-up. Tien powers up and Trunks transforms into a Super Saiyan. At Capsule Corp. Vegeta is seen watching the match on TV. Disgusted, he switches the TV off and lays back. Charging through a Destructo Disk, Trunks slams Tien into the water, giving Trunks the win. The third match between Krillin and Piccolo was brief. Clearly irritated by his opponent, Piccolo forfeits by leaving, giving Krillin the win. During all this Hercule is trying various ways to get off the island so he doesn't face any of the Z-Fighters, but all of them fail. Gohan, Trunks, Krillin and Dosqoi proceed to the finals and head to separate battle zones. Krillin is confronted by a mysterious woman named Zangya, who beats him flat while Dosqoi is killed by Bido.

Everyone soon begins to realize what's wrong as Trunks is challenged by Kogu and Gohan confronts Bujin. During this time, Hercule is in the rest room, thinking about how he got himself in this mess, but after looking at his belt he realizes that the people need him and, in an uncharacteristically brave mood he goes out and gets slammed into a pod and sent to the fighting. During his fight against Kogu, Trunks transforms into a Super Saiyan, shatters Kogu's sword and shoves his fist right through Kogu's chest, killing him. As he turns to leave, he is struck down in one blow by an unknown foe. Far away, Vegeta felt this power and knew something was up. Gohan continues his fight with Bujin until he is lead out to where Krillin and Trunks are. After inspecting his fallen friends, Bojack introduces himself and tells him his plans to rule the universe as his revenge. Yamcha and Tien turn up to fight but are defeated by Bujin, Bido and Zangya. Seeing his friends fallen, Gohan transforms into a Super Saiyan and fights them while Bojack watches on in amusement. Gohan is beaten down and Bojack powers up an attack to finish him off, although it was deflected by Piccolo, who had come to Gohan's aid. Trunks comes back into action and they both challenge Bojack. After a period of fighting Trunks's sword appears; catching it as Vegeta enters the fight and transforms into a Super Saiyan, quickly setting on Bojack. During this, Trunks thinks that Vegeta would only ever fight when it meant him surpassing Goku's strength, and he realises that Vegeta has truly changed. While Vegeta and Bojack fight the rest fought against his last surviving henchman. During his fight against Vegeta, Bojack beats him down and transforms. Gohan rushes to Piccolo's aid, but Piccolo tells him to not worry about him and fight Bojack. Bojack challenges Gohan to a fight and beats him to a bloody pulp thanks to the aid of Bido and Zangya's Untrapped ropes, which drains Gohan's energy away, but is freed when Hercule's incoming pod distracts them all. Annoyed at this, Bojack powers up an attack and blasts Hercule's pod causing him to fall to the ground. Trying to save him, Gohan is struck down by Bojack's henchmen.

On Snake Way with King Kai, Goku can't watch any more and, using his Instant Transmission, teleports himself to the fight and punches Bojack before he can finish Gohan off. Surprised, Bojack falls to the ground. After a few words of advice, Goku places his son on the ground safely and disappears. Gohan, taking in his father's words, gets back and turns to Bojack with fire in his eyes. Gohan transforms into Super Saiyan 2, surprising Bojack and his crew. Gohan beats Bido and Bujin each in one hit, breaking them both in half, and Zangya is killed when Bojack uses her as a shield from Gohan. The angry young Saiyan then slams his fist into Bojack's stomach, with it blowing a hole in his stomach and out through his back. As a last resort, Bojack powers up his Galactic Buster and Gohan prepares a Kamehameha. The energies clash together and in the blinding light Bojack is killed. Gohan, exhausted, falls backwards laughing as Goku praises him from Other World, and King Kai jokes that he broke the rules of going back to Earth while dead. After the events, everyone is in hospital watching the news that Hercule is the one who defeated the alien intruders and is called a true hero while everyone jokes about him.

As in Super Android 13!, the film closes with Piccolo and Vegeta on the roof, arms folded and backs turned to each other, isolating themselves from the celebration.