Just as he leaves Piccolo comes in! Everyone is surprised at the arrival of Piccolo. Piccolo explains that Goku will not be able to defeat Radditz, not alone. This is when an alliance forms between Goku and Piccolo. They agree to work together to finish Radditz off. Piccolo explains that he is not doing this to rescue Gohan, but because Radditz is coming between Piccolo's plans of conquering the world.

Goku and Piccolo have no trouble finding them since Gohan had a dragonball on his hat. They followed them with the Dragon Radar (remember it form Dragonball). They arrive to find Gohan trapped crying in Radditz space ship. They must first fight Radditz to get Gohan so they do this. At first it looks really bad for Goku. 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 Radditz and head butts him, which causes Radditz's armor to break, but Radditz then pushes Gohan away. Everyone is surprised at Gohan's high power level. Piccolo and Goku are still fighting and then Goku is able to get hold of Piccolo and tells him to do his finishing attack, which goes through Radditz and Goku as well.

Radditz asks why Goku sacrificed his life just to destroy him, Piccolo explains to him that he can easily be revived by the Dragon Balls. Radditz explains to Piccolo that everything that he just told him was also told to Radditz's fellow Saiyans, the last of the Saiyans, and that they were going to come to Earth to finish them off and find the Dragonballs within a couple of months and that they are a lot stronger than he, then dies. Goku dies as well.

So now everyone has to start training for the arrival of the other Saiyans, which are supposed to be way stronger than Radditz. Piccolo kidnaps Gohan and decides to train him. He lets him alone in a deserted island to live on his own for a couple of months, and if he lived, he would then be worthy of receiving training. The months go by and Piccolo then trains Gohan, while Krillin, Tien, Yamcha, Yajirobe, and Chiaotzu receive special training by Kami.Goku, rather than retiring in Heaven, is sent on a quest to run on Snake Way and to seek King Kaiou to receive training for the upcoming fight with the upcoming Saiyans. Finally he arrives to King kaiou little planet. There he learns how to do the "Kaioken" and the "Genki Dama". During this time Piccolo teaches Gohan how to use his tremendous hidden powers so that he may assist in the battle.

A year has passed, and the Saiyajins land in a heavily populated city After destroying it, they head to battle Piccolo and the others. The earthlings put up a good fight, but unfortunately Goku has not returned yet from his training and is unable to assist them. Seeing how weak their opponents are, the Saiyans unleash six Saiba men( little green monsters ), each as powerful as Radditz was. They are destroyed fairly easily by Tien and Krillin, but unfortunately Yamcha is killed as one of the aliens self-destructs.The two Saiyan's names are Nappa and Vegeta. Vegeta does not fight at all, but just watches and gives orders to Nappa. This is when Piccolo first finds out about who he really is since the Saiyans call him a "Namek". Nappa then decides to join the fray, and he easily kills Tien and Chiaotzu( Who self-destructed in a attempt to kill Nappa ) without taking much damage. Krillin then tells Vegeta to wait for Goku to arrive, as then they would have a fighting chance. They wait for three hours, but no Goku. 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 cowardness 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 Goku for the fight to really start.

After Goku 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 Saiyan'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 when he covers Gohan from the fireball.

Goku finally arrives with a power level of 5,000 . He comes to find out that all of the Z warriors, except for Krillin and Gohan had died and attacks Nappa. easily defeats Nappa. Vegeta sees Nappa's uselessness and kills him with a single fireball. The fight between Goku 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. Goku decides to do the Genki Dama, 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 Goku up to the point where he is almost dead. Yajirobe, 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. Goku, now badly hurt, calls Krillin and tells him to do the Genki Dama for him (Goku 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. Oozaru Gohan kicks Vegeta around. Later, Gohan gets his tail cut off by Vegeta , but he lands on Vegeta. Vegeta, weary and defeated, crawls to his space shuttle, Krillin now really weak, finds his last strength to finish Vegeta off by killing him with Yajirobe's sword, but Goku decides not to kill Vegeta and lets him go. Vegeta leaves swearing vengeance.