Ten years have passed sence DBZ, and Goku had left with Ubuu to train. He has progressed greatly. The appearance of one of Goku's old enemies changes everything. Pilaf, discoveres some Dragonballs with black stars in them. Thinking that there is no difference, he calls upon the dragon, but is discovered by Goku. Pilaf, seeing that he can't do a thing against him, whispers to himself that if Goku where still a little kid it would be easier for him to defeat him. Shenlong hears the wish and grants it. Now goku is a kid again, that's not the worse part of it, Kaio Sama informs them that if they don't get those dragonballs (that are gathered through the universe) before one year passes, the planet in which the wish was made will be destroyed, it just so happens to be Earth. Burma and Gohan prepare a spaceship for the search that Goku, Trunks, and Goten are going to make. The bad thing is that Pan, also wants to go, and was gets mad and accidentally makes the ship leave with her inside, leaving Goten behind.The three are now about to begin thier search. A part of the ship gets broken so they must stop in a planted called Imegga. There, they meet and steal a small robot, because it ate the dragon radar. The robot's name is Gill (Now the dragon radar and Gill are one).
On that planet they battle someone named Don Keer, because he took their space ship. They get their ship back, fix it, and continued their search. Thanks to Gill, they find two balls in the planets Moonmars and Kelbo, but in the last planet, an unknown character steals it. They stop their chase and discover that this character (Bonpara), along with two assistants (Donpara y Sonpara) work for the master Orador, that wants to resurect the God of destruction Loud. In the end the god awakens, although the master Orador converts Pan into a doll for a while, he gets defeated. During these hunt for the balls, we meet a character by the name of Dr. Myuu. One of Dr. Myuu's projects is Baby. Baby is the only surviving Tsufuru of Planet Plant, which was destroyed by the Saiyans back when the Saiyans worked as mercenaries for Freeza. As the only survivor, Baby wants revenge on all Saiyans. Dr. Myuu found Baby in space and saved him. Baby has the power to take over bodies and acquire his victims' power.
Following this trip they find another dragonball in the planet Luzede and are lead by Gill to a planet where there are millions of copies of him (Gill). This planet is property of its creator, Dr. Myuu, that along with his bodyguard Rilld, plans to gather the energy of the Saiyans to give life to his creation: the mutant Baby. Although Rilld defeats them, they are not able to extract enough energy and Baby is brought back to life incomplete, and is defeated easily. Baby then processes Rilld and later escapes processing Dr. Myu. They have no problems defeating Rilld, and without being able stop Dr. Muy, they leave on their journey with the now regreting Gill. Gill discovers another dragonball and although small, ends up being another pocession of Baby (even after Baby has left their bodies, an egg stays inside them and they are zombies). In the end he dominates Trunks, but through a mental fight, he is able to undue himself from his control and continues on his mission. Some how Baby is able to get to Earth and possesses Gohan and Goten, that causes Vegeta to be introduced.
Baby then decides on a body, Vegeta's! Now he is known as Vegeta-Baby, and destroys Gill. Pan is able to save herself because Buu, saves her along with Satan. Mr. Popo, also under the control of Baby, makes a wish to make a new Planet Plant, Baby's original planet. The new planet appears and since it has no inhabitants, he decides to trap humans in it.
Meanwhile, Goku finds a way to defeat Vegeta-Baby, grows his tail to grow back again. Now with a tail, Goku travels to Planet Plant, even not in SSJ3 he is able to defeat Baby very easily. It is now, that he is half dead, looks at the full Earth like a full moon, and transforms into Oozaru, gold. At first he losses control and starts destroying everything, but Pan calms him down. Now he goes through another transformation, Super Saiya-jin 4, and has a red fur coat. He is now consious and puts Pan in a safe place and faces Vegeta-Baby. Goku is now a lot stronger than Baby. So now Bulma (under mind control as well), invents a gadget to make Vegeta go Oozaru, making the tables turn. After a long and hard battle, both end up on the floor and unconsious. Kaio-shin finds a way to release everyone from Baby's mind control. The cure is called Chou-sui water. Popo and Dende are cleansed. This water is spread to everyone. Gohan, Goten, Trunks, and Pan surround Goku and form a circle to donate their energy to Goku. Goku and Vegeta-Baby face each other once again. Goku does a Kamehameha to defeat Vegeta-Baby. Baby leaves Vegeta’s body and is killed.
It is all over now, but now the worse has come. Since the Dragonballs were used again (to make a planet Plant), the Earth will be destroyed within two weeks. Goku and Kaio-shin transport everyone on Earth to planet Plant, but Picollo doesn’t leave the Earth, and if the Earth should die, so should he, because he loved it so much. He is left on Earth to die, and the Earth explodes and disappears. Thanks to the Namek Dragonballs, the Earth is brought back, but Piccolo is still dead.
