Dragon Ball Kai

Bulma has invited everyone to a party at Capsule Corporation. Goku's family is ready to leave for the party. The only problem is that Goku is nowhere to be found. A frustrated Chi-Chi, Gohan, and Goten leave without him. While everyone's having a good time at the party, Goku is out on a mountaintop. He is looking after some eggs that are ready to hatch; Goku protects the eggs from the storm and predators. After the eggs hatch, he finally arrives at the party, which delights everyone.

It has been ten years since Buu was defeated. Goku, Goten, Vegeta and Trunks enter the World Martial Arts Tournament, where they also meet up with old friends and family.

The World Martial Arts Tournament begins, and Goku battles the mysterious fighter called Uub.

Soon after, Gohan saves the passengers of a plane about to crash and extinguished a fire that caught fire in a building in the city by destroying the water container. On his way to school, Gohan is chased by Videl in her helicopter, who is trying to find out who is hiding under the mask of Great Saiyaman. Gohan escapes by placing Videl's helicopter on the roof of a building. Both of them arrive to school late, which leads Videl to be even more suspicious of Gohan. Later, kidnappers from the Red Shark gang take the mayor of Satan City hostage. The police warn Videl of the situation, so she responds by confronting the leader of the gang. Meanwhile, Gohan, growing impatient of class since he would rather assist Videl as The Great Saiyaman, starts aggressively tapping his foot, triggering an earthquake. He slid out of class during the confusion and arrives to the scene of the crime as the Great Saiyaman. Gohan saves the mayor of the city while stopping the attempts of the rest of the gang. Videl learns that Gohan was out of school at the same time. Videl is led to believe that Gohan and Great Saiyaman could really be the same person.

The next day, Gohan learns that Chobi, who is the child of Toto the pterodactyl, has been captured by a circus and put on display. In his attempt to rescue Chobi, Gohan is portrayed as a criminal. Videl pursues Gohan as a suspect. When Chobi's parents attack the city in search of their child, Gohan manages to handle the situation and return Chobi to his parents. Videl discovers the truth that Gohan is Great Saiyaman. Videl blackmails Gohan into participating in the 25th World Martial Arts Tournament. As some of the other Z Fighters express interest in the tournament, Goku calls out from the Other World and says he will return to Earth for a single day to participate.

After Gohan spreads word of the tournament to the others as well as managing to convince Chi-Chi to let him participate himself, Gohan takes a leave of absence from school and begins training with Goten. Gohan is surprised to find that Goten not only possesses great strength, but he is also already capable of transforming into a Super Saiyan even though he has yet to learn how to fly. Videl comes around to have Gohan make good on his promise to teach her how to fly.

The preliminary rounds begin. The fighters must hit a punching machine to rank their strength. The Dragon Team effortlessly qualifies for the tournament. Vegeta destroys the machine with a single punch. Afterwards, Goku and the others decide to go and watch the tournament of the juniors division.

While Trunks seems to have the advantage, Goten turns Super Saiyan to free himself from his opponent's grasp when he was not allowed to do so. Trunks takes on a challenge by trying to beat Goten with only his right arm. The latter also becomes a Super Saiyan and sends an energy ball to hit Goten, which lands on a part of the bleachers. The final juniors division match eventually comes to an end, where a sneak attack by Trunks causes Goten to lose by ring out. Trunks wins the battle as well as the juniors division tournament. Trunks will fight Mr. Satan in an exhibition match. Mr. Satan watched the fight between Goten and Trunks. He is reminded of the battle with Cell. Mr. Satan faces a problem because he has to fight against Trunks. After various attempts to try to get out of the fight, Mr. Satan decides to pretend to lose and have Trunks hold back his attack in order to keep up his public appearance. Trunks' weakest punch manages to send Mr. Satan flying out of the ring.

Piccolo abandons his fight against Shin. Piccolo learns from Kibito that Shin is actually the Supreme Kai. The Supreme Kai is believed to be even more powerful than the Grand Kai. Videl is fighting against Spopovitch. Videl appears to get the upper hand in her match, but Spopovitch keeps getting up no matter how many times he is knocked down. He eventually fights back. Goku suspects that something is amiss about Spopovitch. Goku realizes that Spopovitch is no longer the same person as in the past and thinks that Videl must abandon the fight. The last time Spopovitch participated in the tournament, he barely lasted 5 seconds in front of Mr. Satan. Something has changed in him. He has acquired new powers. This proves true when he continues fighting even after Videl breaks his neck. Seeing his opponent tired, Spopovitch regains the lead over Videl. Videl attempts to use her flight to regain her strength, but Spopovitch follows her into the air and uses an energy blast against her. As Videl refuses to give up despite the beating she is taking, Goku wonders where Spopovitch got his power from.

Goku uses his Instant Transmission to deliver some Senzu beans from Korin. He gives the Senzu beans to Gohan. Gohan rushes to the infirmary to give one to Videl. Gohan gives a Senzu bean to Videl to restore her to full health. Gohan's identity as Great Saiyaman is revealed to his classmates after his bandana was blown off during his outburst. Gohan steps up to face against Kibito, who requests to see Gohan's Super Saiyan transformation. After Piccolo informs the other Z-Fighters of Shin's identity as the Supreme Kai, he orders Gohan to transform. Shin asks Goku and the others not to intervene. Right after Gohan transforms, Spopovitch and Yamu appear and hold Gohan down. Spopovitch and Yamu use a device to drain his Super Saiyan energy. Spopovitch and Yamu's mission is accomplished. Spopovitch and Yamu fly away. Gohan is left weakened. As Kibito offers to heal Gohan to full health, the Supreme Kai asks Goku and the others to join him in pursuing the culprits.