Seven years after the original Dragonball saga, Son Goku and Chi-Chi have had a son named Son Gohan after Goku's adoptive grandfather. All is peaceful as Goku journeys with Gohan to a reunion with his friends at Kame House. All the while, a strange warrior with a tail and long black hair has come to earth as well. While first confronting Piccolo, the offspring of Piccolo Daimo, the strange warrior senses Goku with a device and heads his way. The warrior, who arrives at Kame House, introduces himself as part of a warrior race called the Saiyajin, as well as being Goku's brother. He explains how Goku was meant to come to earth and then destroy everything in preparation for sale. Though this man named Radtiz requests Goku (or Kakarotto, as he is called by Saiyajin) to rejoin him and destroy the earth's inhabitants, but of course, he refuses. Angered by his defiance, Raditz kidnaps his son Gohan, and flies off. Goku, knowing he can not defeat his brother alone, employs the assistance of Piccolo. Even though they both attack the Saiyajin warrior, the two are still toppled by Raditz's superior power. Even Son Goku's Kamehameha has no effect on him. At this point, Piccolo tells Goku of a new secret attack he's been working on that was previously designated for Goku himself. However, in the current circumstances, Piccolo would have to use the attack on Radtiz. Because of how long the attack takes to charge, Goku must face Raditz alone, allowing him to be pummeled. Piccolo finally finishes charging up and shoots the beam he calls Makankosappo. However, the attack misses. At that moment, Gohan, seeing his father being beat up, becomes enraged and breaks out of the Saiyajin Space Pod that is his prison. Gohan charges and head butts Raditz, leaving him temporarily stunned. With that chance, Son Goku grabs hold of Raditz's tail and tells Piccolo to try the attack again. (As a side note, Piccolo only has one arm at the moment). Piccolo finally shoots the beam while Goku is still hold Raditz, blowing through them both. The two warriors die, but before they do, Piccolo mentions how Goku will be revived with the Dragonballs. Here, Raditz reveals that his power-sensing device (a scouter) can also be used as a means of communication. He tells them that the other Saiyajin know about the dragonballs and will arrive on earth in a year. At last, he falls silent.
From here, everyone basically begins training for the arrival. While Kuririn, Yamcha, Tienshinhan, Choazhu, and Yajirobe train at Kame's Lookout while Gohan trains with Piccolo. Of course, Gohan did not go with Piccolo voluntarily; he was technically kidnapped by Piccolo, who hoped that he could teach teh child to control his great power. Meanwhile in heaven, Son Goku heads toward Kaiou-Sama's planet in hopes of receiving training. On the way there, he faces a demon snake in the form of a princess and falls into hell as well. Eventually, he does reach the small planet, and begins his training be chasing Kaiou-Sama's monkey, Bubbles, and then Gregory. As a more advanced technique, Son Goku also learns the art of Kaioken, where he can multiply his power, though his body will eventually collapse if too much power is released. The other more important ability is the Genki Dama, which draws upon the energies of the planet to form a devastating energy ball. After a year passes, the Saiyajin, known as Nappa and Vegeta, land. After destroying a city, they head to battle Piccolo and the others. The earthlings must then fight six Saibamen, released by Nappa. Most of them are easily destroyed, but Yamcha is killed by the self destruction of one of the aliens. You'll find later that Yamcha gets beaten pretty easily in future battles as well, like the 'lil thing with Dr. Gero. Anyway, Nappa joins in the battle, killing Tienshinhan and Choazhu easily. Though Kuririn convinces Vegeta to wait for Goku, the three warriors are left only given three hours of rest. When three hours are up, the battles resumes, still with no sign of Goku. Kuririn and Piccolo plan an attack to destroy Nappa, and may have succeeded, if Gohan did no chicken out at the last moment. Later, Piccolo sacrifices himself to save Gohan from one of Nappa's blasts. As a result, Kame dies as well. Kuririn and Gohan are the only survivors when Goku arrives. Extremely angry, Goku defeats Nappa easily. Vegeta and Goku then face off, and it would appear that Goku is too powerful for Vegeta when he unleashes his Kaioken attacks. Seeing that he was overpowered, Vegeta transforms himself into an Ozaruu. In doing so, Vegeta beats Goku around, smashing his legs as well. This continues until Yajirobe saves the day by cutting off Vegeta's tail. Kuririn and Gohan then have to battles Vegeta. While Gohan is no match for the Saiyajin prince, Goku hands Kuririn the remaining energy from the Genki Dama he was gathering. Using the power of the earth, Kuririn defeats Vegeta, forcing him to flee from the planet.
The series begins as Freeza goes in search of the Dragonballs on Planet Namek. Bulma also discovers that there are Dragonballs on Namek but it would take thousands of years to get there. Popo appears and tells about the ship that Piccolo and Kame used to travel to Earth. With the faster spaceship, Bulma, Kuririn, and Gohan set out on a journey to Namek but arrive on an abandoned planet made to look like Namek. After a while, they figure out that it is a fake planet, leave, and finally arrive on the real Namek. However, just as they reach there, they discover that both Vegeta and Freeza, with his henchmen, have arrived. All are after the Dragonballs, some for different reasons.
Goku later travels to Namek after recovering from the fight against Vegeta. During his trip, he trains at fifty times Earth. s gravity and one hundred times Earth. s gravity. Meanwhile, Vegeta begins to fight against Freeza. s henchmen. He first dispatches a scout (Kui or something) that Freeza sends out by first hiding his power level. Then he fights Dodoria and defeats him. Then follows the fight with Zarbon. At first, it looks as if Vegeta will win easily. Then Zarbon turns into his second form and almost kills Vegeta. Surviving the fight, Vegeta gets stronger and in the second fight with Zarbon, he eliminates him easily. Vegeta joins up with Kuririn and Gohan only to ensure that Goku is around so he can kill him. Freeza then calls on Team Ginyu to dispatch Vegeta. Gohan and Krillin fight Guldo first, but Vegeta winds up killing him. Vegeta is then beaten by Recoome and Gohan tries his luck, but is also beaten. Goku then shows up and dispatches Recoome, Burter, and Jaice. When fighting Captain Ginyu, Goku has his body switched into Captain Ginyu's. After more fighting, Goku gets his body back. Then, Ginyu tries to swap bodies with Vegeta, but Goku throws a frog in his path and Ginyu is turned into a frog. Piccolo, merged with Nail, defeats Freeza in his second form but is severely defeated by form 3. Then the fight against Freeza takes place. Freeza goes through 3 transformations to reach his perfect form, each one because Son Goku uses kaioken x20, then a Genki Dama. After the Genki Dama is hurled at Freeza, everyone thinks that he is dead, but out of no where, Freeza pops up again. He shoots Piccolo and then blows Kuririn up, triggering one of the most important events in Dragonball Z. Goku gets so angry that he turns into his Super Saiyajin form for the first time. He severely beats Freeza, but Namek is about to blow up. The Dragonballs are used to wish everyone back who died as a result of Frieza, including Vegeta as a result. Then, everyone on Namek except Freeza and Goku are teleported to Earth with another wish. Namek blows up and everyone thinks Goku is dead, but Goku goes to planet Yardat and learns the ability to teleport. Meanwhile, Freeza. s father, King Cold learns about Freeza. s defeat and sends minions out to reassemble Freeza. s body. Freeza tells his father about Goku but Cold doesn. t believe him and still thinks that he is the universe. s strongest warrior.
Freeza, Cold, and their henchmen land on earth and seek revenge and to destroy Earth. Suddenly, a teenage named Trunks appears out of nowhere, turns Super Saiyajin, and annihilates the adversaries. Trunks tells Goku that he is Vegeta and Bulma. s future son and that he was sent back in time with a medicine to prevent Goku. s death so that the future is not in chaos. He also tells of the androids that will appear in three years and everyone vows to train hard until then.
This series starts off as Dr. Gero plots his revenge. He starts off by creating Android #19 to destroy Goku, and so the two androids roam the city streets, absorbing human energy as they go along. The Z Warriors investigate the happenings, but Yamcha ends up getting impaled by Dr. Gero (#20). Fortunately, Yamcha is saved qickly by a Senzu, but Goku, Tienshinhan, and Piccolo remain to do battle with the androids. Goku practically annihilates Android 19, but then, the heart attack that Trunks told of struck him. Because Goku never felt any symptoms, he never took the prepared medicine. Goku leaves the battle as his savior (who is surprisingly Vegeta) kicks limp body to Piccolo. Vegeta faces Android #19 and, to everyone's astonishment, turns Super Saiyajin. Dr. Gero's plot fails and Android #19 is destroyed. Vegeta then chases Dr. Gero all over the place, ending up with a battle between the android and Piccolo. Piccolo totally overpowers the robot, and breaks of his arm. In the end, Dr. Gero gets away when he sets a distraction by destroying Bulma and Yajirobe's ship.
Android #20 then works on developing a better android model. Meanwhile, he unleashes two of his other creations, Android #17 and Android #18. Androids #17 and #18 get annoyed of Dr. Gero. As a result, they kill Dr. Gero. However, the doctor had finished creating another android in a different timline. That android stole Trunks' time machine and came to the present three years before Trunks arrived. His command was to absorb the two rebellious androids that betrayed Dr. Gero. Android #17 and Android #18 then leave the lab (which got blasted by Trunks' Burning Attack) and unleash Android #16. But as it turns out, Android #16 is a peaceful android. As time passes, the Z Warriors become aware of the new androids as they battle again and again but always reach a stalemate. However, the Z Warriors are still not match for the androids because the androids are robots, and therefore do not tire in a long battle while the Z Warriors eventually run out of energy. The Saiyans do not continue to fight the androids. Instead, they train in a chamber to get stronger. Meanwhile, Piccolo fuses with Kame, his half father, to become stronger. Dende, a Namek child, replaces Kame as guardian of the dragonballs. The new, much stronger Piccolo, goes in pursuit of the "other android" that is known as Cell, which is pronounced Ceru in Japanese. Piccolo is stroner than Cell, but fails to defeat him, and so Cell continuously plagues the cities.
Androids #16, #17, and #18 go to seek Goku to destroy him. Piccolo finds the androids first and begins to fight them. Cell flies to find Androids #17 and #18. On his way devours the bodies of the unlucky civilians he passes to become stronger. Finally, he meets with the other androids and to the heroes' surprise, they learn that Androids #17 and #18 know nothing about Cell. Cell and Android #17 threaten to kill each other. Android #17 heads out to fight him. But, he does not stand up to Cell and is easily defeated. This is when our heroes learn the great powers of Cell. Android #18 is now worried, but Android #16 flies out to fight Cell. To everybody's amazement, Android #16 is able to stand up to Cell. However, he is still destroyed. Cell now heads for his goal and devours Android #17 with his tail. Cell now changes into Cell-form 2. With the power of Android #17 combined to his, he becomes stronger than ever. Then, he heads over to devour Android #18. At this moment and time, Vegeta and Trunks come out of the Room of Spirit and Time to do battle with Cell. To everyone's amazement, Vegeta can easily destroy Cell. Yet, being the idiot that he is, he lets Cell go and find #18 in order to make himself a worthy opponent. Even though Trunks wouldn't allow it, Vegeta kept Trunks form saving #18, who was actually in plain the whole time. She is devoured, and now Cell changes into Cell form 3, and becomes "Perfect Cell." After devouring the bodies of so many people, is no longer an android and becomes organic.
After Cell is gone, Bulma collects the body parts of Android #16 and repairs him. But, he is re-programmed to fight on the Z Warriors' side. Our heroes now head out to fight Cell. But, Android #16 is once again destroyed. Cell grows strong enough and reproduces. From his body came 7 Cell Juniors, young, blue duplicates of Cell. After a few more battles, Gohan, now a teenager, watches Cell crush #16 and Gohan reaches Super Saiyan level 2. He then destroys all the Cell Juniors. In one of the battles that follows, Cell is kicked and Android #18 is spit back out. Cell turns back into form 2 and is defeated. But, he activates his self destruction mode so that when he dies, the world will blow up with him. To save the Earth, Goku teleports Cell out of Earth and into Kaio Sama. s planet, where Cell blows up. Thus, Goku, Kaio Sama, Bubbles, and Gregory die as well.
The Z Warriors mourn the loss of Goku, but at the same time they cheer at the victory over Cell. Unexpectedly, a fireball flies out of nowhere and pierces through Trunks. Upon Trunks' death, Cell, in form 3, appears. He tells that when he blew up, a brain cell survived. From the cell, other cells multiplied and he was once again formed. Cell happily laughs as he tells that he is amazed he is able to rebuild himself into form 3, though because of the Saiayjin DNA, he was able to drastically improve his power after facing death, making him Super Perfect Cell! Then, Cell threatens to destroy the earth. Vegeta tries to take on Cell, but is knocked down in one blow. Cell fires a shot at him that would have killed him, but Gohan rushes over and takes the blow, injuring his arm. For the first time ever, Vegeta apologizes. Now it was up to Gohan to try to save Earth. With one arm, Gohan prepares a Kamehameha. He fires at Cell and Cell fires back. A stalemate is meant, but with Kaio Sama. s help, Goku is able to talk to Gohan and encourages him. Meanwhile, Kuririn protects the unconscious Android #18 and Yamcha, Tien-shinan, Piccolo and Vegeta attack Cell in hope that this will help Gohan distract Cell. Kuririn eventually joins them. With the help of the now dead Kaio Sama, Goku is able to communicate with Gohan and tells him to use all his power to defeat Cell. Gohan overpowers Cell and Cell is disintegrated by Gohan's Kamehameha. But, Mr. Satan takes credit for Cell's death and lies to the reporters.
At the end, the warriors gather the dragonballs to bring those killed by Cell back to life. However, Goku is still dead because he's already been brought back once, but tells that he is okay and is now with Kaio Sama. Android #18 awakens and flees. However, everybody learns here that Kuririn has developed a crush on Android #18!
The final series of Dragonball Z starts off with Goku competing in a fighting tournament in one of the four Kai's planet. The result is that Goku ties with his worthy opponent. Meanwhile, Gohan is training Goten in martial arts while Vegeta trains Trunks. Both Gohan and Vegeta are surprised at how strong Goten and Trunks are as they turn into their Super Saiyajin form at such a young age. Gohan also has a girlfriend (Satan's daughter).
Later, Gohan, a hero who has achieved the identity as the Great Saiya Man, attends a tournament. When it is the Great Saiyan Mans turn to compete, he turns into his Super Saiyajin form and his disguise is blown off. Everyone is amazed that a nerd, Gohan, is the Great Saiyan Man. All of a sudden, Spopobitch and Yamu come out of nowhere and absorb Gohan's energy into a "lamp" to revive Buu. Kaio-shin and his partner, trying to prevent Babi-di's and Dabura's plot to reactivate Buu, allow this to happen so that he could follow the energy stealers to their hideout. (Babi-di's goal is to destroy all life just for the fun of it.) But, he revives Gohan first. The Saiyan warriors decide to go as well. A fight follows. Darbura turns Kuririn and Piccolo into stone and Kaio-shin's partner is killed. The Z warriors learn that Kuririn and Piccolo will return to normal once Darbura dies. In battle, Vegeta is turned into Babi-di's slave and an "M" appears on Vegeta's forehead. His energy is used to reactivate Buu. Buu betrays Dabura and eats him. Thus, Piccolo and Kuririn are returned to normal. Majin-Vegeta beats Goku, and then goes to fight Buu. Upon failing, Vegeta self-destructs and dies. Afterwards, Bulma gathers the dragonballs to revive all those killed since the fighting tournament. In the fights later on, Goku gets angry enough and reaches Super Saiyajin form 3 for the first time! (In stage three, Goku has long hair and is more powerful than ever.) Gohan also heads to Kaio-shin's planet, pulls out the Z sword, and trains under Rou Kaoi-shin. Goten and Trunks train as well to get stronger. From Goku, they learn the art of fusion to fuse to become one, becoming Gotenks!
However, our heroes are still no match for Buu. Although Dabura's, the Prince of Darkness (Babi-di's associate who looks like a devil), and Babi-di's (a little ugly sorcerer with tiny hairs growing out of his body) other minions are killed, Buu gets stronger. Buu later revolts against his master (Babi-di) and kills him. Before their deaths, the villainous Babi-di and Dabura have cast a spell that turned Vegeta evil. However, in addition with fighting against Goku, the evil Vegeta also fought Boo. Although defeated by Buu, Vegeta later turns good again. It is here that Vegeta finally officially becomes one of the good guys. (In previous times, Vegeta only aids our heroes to assure that Goku lives long enough for him to kill him. But, he never attempted to kill Goku since the early battle against him in the Vegeta Series. Next, Buu separates into two forms-one good and the other evil. Evil Boo defeats good Buu, turns the him into a cookie, and eats him. From this method, the evil Buu gains the good Buu's powers and changes into a stronger form. Buu, previously fat, is now skinnier and taller, not to mention a lot stronger. Gotenks is also stronger; he is now able to turn into Super Saiyajin stage 3, like Goku. But, he is still defeated on one of his encounters with Buu and Buu engulfs SSJ3 Gotenks. Thus, Buu absorbed Gotenks' powers and becomes stronger again. He changes form again! (His "antennae" grows longer and he now wears a black vest like Gotenks'.) Piccolo is also defeated and eaten by Buu. Meanwhile, Gohan had mastered the Z sword and learned how to use his hidden powers without getting angry under training with Dai Kaio-shin. (He does not turn into his Super Saiyajin form for the rest of the series at this point.) Unfortunately, he too is defeated and engulfed. Buu, now with Gohan's powers, changes form again. (He now looks like he's wearing Gohan's clothes.) With the other warriors defeated, only Goku and Vegeta are left to battle against Boo!
Goku is still dead and watches the fight through Kaio-shin's crystal ball. Seeing the unfortunate odds for our heroes, Rou Kaio-shin sacrifices his life to Goku and dies. Goku's halo disappears, and Rou Kaio-shin wakes back up with a halo over his head. Now, Goku teleports into the battle. Vegeta, still dead, is also sent into battle by the judge of death. Goku acquired a pair of special earrings from the Kaio-shins that when each one is worn by different people, the two will permanently fuse. With Goku wearing one of the earrings and Vegeta wearing the other, the two are pulled together and fused into Vegetto. At Vegettos turn to fight Buu, Buu seems to be of no match to Vegetto, but Vegetto purposely gets eaten by Buu to save the other Z warriors. This canceled the effects of the permanent fusion in Vegetto and he fisses back into Goku and Vegeta.
Next, Boo undergoes another form change and temporarily becomes very muscular as he stands still in pain through the form change. Goku and Vegeta are now inside of Boo's organs. They find Trunks, Goten, Gohan, and Piccolo, and rescue them by carrying them out of one of Buu's pores. As they leave Buu, the warriors grow bigger and are restored to their normal size. Fat Buu, the good Buu, also escapes from Buu's body. The evil Buu, still "puffy" and bulky, is undergoing his form change to restore to his original form. The Kaio-shins cursed him into his previous fat looking form for destroying their people. Afterwards, he is little and short. Next, evil Buu does a giant fireball and blows up Earth!!! Luckily, Goku had enough time and teleported himself and his comrades to another planet. Later, the Namek dragonballs are gathered and a wish is made to restore the earth. The little Boo also met with the fat Buu. They fight, but the good Buu is once again defeated.
Eventually, Goku and Vegeta are later fighting Buu. Vegeta stalls Buu as Goku gathers the energy to do a super Genki-Dama fireball. While Vegeta is getting kicked around by Buu, Piccolo, Gohan, Goten, and Trunks are on earth trying to convince the earthlings to raise their hands so that their energy will be given to aid Goku strengthen his fireball. Because no one on earth listens to the heroes, a new approach is taken. Satan is contacted for help. Because of his fame, he goes into public and raises his hands. All of his fans, everyone on Earth, raise their hands too to show their appreciation to Satan. With everyone's hand raised, energy is transferred to Goku and now he has enough power to destroy Buu. With a single super fireball, Buu is destroyed.
At the end, the fat Buu, who was beaten unconscious, awakens and enters our heroes' side. Ten years pass. Goten and Trunks are now teenagers. Gohan married Videl and now has a 5 year old daughter, Pan. Goku wished to fight the evil Buu all over again, so he wished for the reincarnation of the evil Buu. The evil Buu, now Uboo, is reincarnated (and not evil anymore) and under the training of Goku. There is peace on earth...