Start of the "Ultimate Dragon Balls/Black Star Saga". After finishing his training with Uub, Goku is turned into a child by a careless wish from Emperor Pilaf, who has summoned the eternal dragon using the black star dragon balls. Afterward, Goku, while re-adjusting to life as a kid, learns that if he doesn't find the black star balls, which are now scattered across the galaxy, in one year's time, the earth will be destroyed. Also, Pan stops a bank robbery.
Trunks grows bored with being the President of Capsule Corporation. Chi-Chi, Gohan, and Videl convince Goku to retrieve the black star dragon balls himself, and Gohan announces his plans to join his father. Bulma, Gohan, and Videl work on the spaceship. Pan resents being treated like a kid and not being allowed to go with Goku, and she spends time with Mr. Satan. Thinking that he is Bulma's and Vegeta's kid, two thugs who are hoping for a ransom "kidnap" Goku; Vegeta recruits Trunks and Goten to join Goku on his mission.
Goku, Trunks, and Pan land on a planet that has another dragon ball. They find it in a village that is being terrorized by Zoonama, a wicked monster that can cause earthquakes by vibrating his whiskers. The village agrees to give up the dragon ball in exchange for ridding them of Zoonama before he takes one of the village women away as his bride.
Goku, Pan, and Trunks chase after the Para Para Brothers, who stole one of their dragon balls. Losing them inside a planet filled with caves, the Para Para Brothers return to their base to give the dragon ball to Cardinal Mutchy Mutchy as the others try to find their way off the planet.
Goku, Pan, and Trunks land on a desert planet. Feeling rejected because Trunks wants to drop her off on Earth, Pan, to prove her worth, searches for the dragon ball that is on the planet while Goku and Trunks work on the spaceship. Also, Giru searches for Pan, who gets lost. Meanwhile, Dolltaki goes to report to Dr. Myuu, but instead he is met by General Rilldo, Myuu's right-hand man.
Goku, Pan, Trunks, agree to land on Giru's home planet so that he can reminisce, but when they get there they find that the planet, completely populated by robots, may not be as friendly as they were led to believe.
Start of the "Baby Saga". Attempting to save Goku and Trunks, Pan sneaks into the robots' compound and fights Nat, a member of the Sigma Force. Meanwhile, General Rilldo uses Giru to view the fighting data of Goku, Trunks, and Pan.
After narrowly escaping General Rilldo, who had been taken over by Baby, Goku, Trunks, and Pan leave planet M2. They find a dragon ball on the wreckage of a ship, which they must retrieve before the ship is sucked into a star.
Vegeta shaves his mustache because Bulla thinks it looks stupid. Bulma and Chi-Chi hope for the safety of Goku, Pan, and Trunks. Goten goes on a date. Goku, Pan, and Trunks find a dragon ball near a sleeping tiger-like creature. Baby arrives on Earth and begins taking over people's bodies, and, after being challenged by Mr. Satan, he fights Goten.
After possessing Goten, Baby looks for Vegeta, but first he must go through Gohan, who recognizes that something has taken control of his brother. Also, Goku, Trunks, and Pan find a dragon ball inside of a dinosaur, and they throw a party for themselves.
Gohan and Goten, both having been possessed by Baby, fight Vegeta, who is returning home after shopping with Bulla. Bulma, Videl, and Chi-Chi worry about Goten. Baby reveals his history. Goku, Trunks, and Pan find the last dragon ball on a snow-covered planet.
Baby-Vegeta uses the black star dragon balls to wish back Planet Vegeta into Earth's orbit. Pan mourns Goku; Goku, somehow not dead from Baby-Vegeta's blast, is trapped in an alternate dimension, and he plays a game with Sugoro, the dimension's ruler, for his life.
When Goku realizes that Sugoro is cheating, he must escape the dimension before the dimension's caretakers, who aren't pleased that Sugoro has been cheating all this time, destroy it. Also, Majin Buu, Pan, and Mr. Satan sneak onto a ship bound for planet Vegeta, and Kibito Kai and Old Kai agree to train Goku for his battle with Baby.
Start of the "Super 17 Saga". It is time again for the World Martial Arts Tournament. Goku, still in child form, fights in the Jr. Division, while Majuub (disguised as "Papaya Man") and Pan fight in the adult bracket. Also, Mr. Satan announces that he will retire from fighting after this year's tournament, Trunks announces his retirement as President of Capsule Corporation, and Vegeta attempts to enter the tournament late.
Dr. Gero and Dr. Myuu join forces in hell to take their revenge on Goku. Using two versions of Android 17, one in hell and one on Earth, they create an opening between the two dimensions. As old enemies return to terrorize the world again, Goku realizes that he must travel to hell to stop the evil doctors.
In hell, Goku continues to fight Cell and Frieza. On Earth, Android 18 fights Android 17 and Gohan continues fighting General Rilldo. Later, Vegeta, Majuub, Trunks, Gohan, and Goten all fight Super Android 17.
Start of the "Shadow Dragon Saga". When the Z Fighters attempt to summon Shenron by using the cracked dragon balls, the shadow dragons, created from the negative energy formed from all of the previous wishes, escape. Once this is explained to them by the Kais, Goku goes after the dragons to stop them from destroying the Earth.
After Shenron restores the lives of everyone who has been killed recently, he invites Goku to go with him. Before they leave Earth, Goku says farewell to his friends and family, who reminisce about their time together.