The Vegeta series all starts off when Gokou goes to Mr. Roshi's island for a visit, since he hadn't seen his friends in years. They were planning on having sort of a reunion. The only ones who are there is Krillin, Bulma, and Master Roshi. Gokou comes in and brings along a little guy that looks a bit like Gokou when he was smaller. Gokou tells them that it is his and Chi-chi's son. His name is Gohan, just as he is being presented to Goku's friends a human like alien by the name of Raditz appears. He tells them all that he is Goku's older brother, and that he comes from another planet called planet Vegeta. He tells them all that he had come back to check up on his brother. Everyone is surprised and Gokou tells him that he doesn't remember anything.  

This is when we find out that Gokou fell on a mountain side when he was small, and suffered from amnesia. He had forgotten his mission of destroying all of the inhabitants of Earth. Raditz asks Gokou what happened to his tail, and Gokou tells him that it had been cut off for good. Raditz gets enraged and tells Gokou that it (the tail) is their true power. Raditz explains that they come from a race of warriors, a race by the name of Saiya-Jin's, and when they see the full moon they can turn into a wear monkey called Oozaru. This is when Gokou first finds out that it was he, Gokou, that had killed his grandfather many years ago. Gokou gets angry and attacks Raditz, but Raditz shows to be a lot stronger than Gokou and knocks him out in one hit. 

Raditz notices that Gohan has a tail and so learns that it is Goku's son. He takes him hostage and leaves. Just as he leaves Piccolo comes in! Everyone is surprised at the arrival of Piccolo. Piccolo explains that Gokou will not be able to defeat Raditz, not alone. This is when an alliance forms between Gokou and Piccolo. They agree to work together to finish Raditz off. Piccolo explains that he is not doing this to rescue Gohan, but because Raditz is coming between Piccolo's plans of conquering the world. Gokou and Piccolo have no trouble finding them since Gohan had a dragon ball on his hat. They followed them with the Dragon Radar (remember it form Dragon ball). They arrive to find Gohan trapped crying in Raditz space ship. They must first fight Raditz to get Gohan so they do this. At first it looks really bad for Gokou.  

Gohan is still trapped in the space ship and with a rage of anger his power level increases tremendously. He manages to break the spaceship and goes directly for Raditz and head butts him, which causes Raditz's armor to break, but Raditz then pushes Gohan away. Everyone is surprised at Gohan's high power level. Piccolo and Gokou are still fighting and then Gokou is able to get hold of Piccolo and tells him to do his finishing attack, which goes through Raditz and Gokou as well. Raditz asks why Gokou sacrificed his life just to destroy him, Piccolo explains to him that he can easily be revived by the Dragon Balls. Raditz explains to Piccolo that everything that he just told him was also told to Raditz's fellow Saiya-Jin's, the last of the Saiya-Jin's, and that they were going to come to Earth to finish them off and find the Dragon Balls within a couple of months and that they are a lot stronger than he, then dies. Gokou dies as well.  

The next to go is Chaozu when he self-destructed in an attempt to kill Nappa. But this did nothing to Nappa. Tien is enraged and goes for Nappa, but gets a limb cut off and later dies.  Then Piccolo and Krillin come in and attack him in mid air when he is not seeing. As Nappa is heading to hit the Earth,  Piccolo and Krillin both scream at Gohan to finish him off, but Gohan show his coward ness and does nothing. This might of been their only chance to defeat him. Vegeta tells Nappa to stop messing around, but to wait a while longer for Gokou for the fight to really start. After Gokou is revived, he first goes to Karin tower to pick up some Senzu beans and takes off in his "Flying Nimbus". Gohan gets extremely angry after Nappa knocks Piccolo unconscious in an attempt to grab his tail, which is supposed to be a Saiya-Jin's weak spot, but Nappa had over come that already. Gohan attacks Nappa, but does no real damage. Then Krillin attacks too, and too has no real damage. Nappa gets angry and sends a powerful attack towards Gohan, but is blocked by Piccolo, and so Piccolo dies.  

Gokou finally arrives with a power level of 5,500 and increasing. He comes to find out that all of the Z warriors, except for Krillin and Gohan had died and attacks Nappa. Nappa is astonished at Goku's power. Vegeta then says that he will personally kill Gokou and so Nappa goes towards Krillin and Gohan. Gokou does the Kaioh-ken which leaves Nappa on the floor. Nappa asks Vegeta for help, but Vegeta kills him in cold blood for being weak. The fight between Gokou and Vegeta begins, Vegeta is then astonished at Goku's power. Since this proves to be a hard match for Vegeta, he decides to turn into Oozaru. Gokou decides to do the Spirit bomb, but he needs time to do this. So he does the "Solar flare" to blind Vegeta for a little while. But Vegeta is too quick and tortures Gokou up to the point where he is almost dead. Yajirobi, which had been in hiding all along comes out of no where and cuts off Vegeta's tail, so now Vegeta goes back to his normal size. Gohan steps into the fight now although he knows he is no match for Vegeta.

Gokou, now badly hurt, calls Krillin and tells him to do the Spirit Bomb for him (Gokou had still been collecting energy during this time). Krillin gets the energy and waits for just the right moment to use it. Krillin fires it, but misses, Gohan gets it back and throws it again and this time hits Vegeta. This sends Vegeta through the air, but is not defeated yet. Since Vegeta had made an artificial moon to turn into Oozaru, Gohan happens to look at it and then too transforms into Oozaru. Now the tables have turned. Gohan, as Oozaru, lands on Vegeta and is now defeated. Krillin, now really weak, finds his last strength to finish Vegeta off by killing him with Yajirobi sword, but Gokou decides not to kill Vegeta and lets him go. Vegeta leaves swearing vengeance.

Continued on to the next 3 sagas.