 
Goku is the main character throughout the Dragonball series. He is first seen in Dragonball. Goku was raised by an old man named Gohan. One day Gohan was killed and Goku is left with the Four Star Dragonball which was Gohan's most treasured posession. When Goku is 12 he runs into a young girl named Bulma. She explains to Goku that she was looking for a Dragonball. Goku shows Bulma that he had a Dragonball in his posession. Goku and Bulma quickly become friends, and go on an adventure to find seven Dragonball's together. While he was searching for the Dragonball's he meets master Roshi, a turtle hermit, who later on trains him along with Krillin to become masters at the Martial Arts. When Goku gets older (around 17) he marries Chi Chi and they have a son who they decide to name Gohan, after Goku's father.
In Dragonball Z, Goku learns that he is really a Saiyan from the planet Vegeta. His brother Radditz tells Goku that he was sent to Earth as a baby to wipe out the human race, and that the only reason Goku didn't complete his task because while he was an infant he had a head injury and forgot about his job to wipe out the earth's population. When Goku says he doesn't beleive him, Radditz takes Gohan as a hostage. Goku and Piccolo eventually catch up to Ridditz and team up to fight him in order to save Gohan. Goku sacrifices himself to destroy Radditz and in the end, he dies.
While in heaven Goku trained hard for he was informed by the great King Kai that he would be fighting with two unknown Saiyans when he returns to Earth. During his training with King Kai, Goku learns a new technique called "Kaio-ken." With his power increased, he goes back to earth (a little late) only to do battle with two new Saiyan warriors, Vegeta and Nappa who have come to destroy him and the planet Earth. He easily defeats Nappa (who is then killed by Vegeta for being a discrase to all saiyans) and goes on to fight Vegeta, who proves to be much more of a challenge. In the end, Goku gets beaten when Vegeta turns into his Oozaru form. He is saved when Gohan turns into his Oozaru form and severely injures Vegeta. Right when Krillin was about to kill Vegeta, Goku tells him not to and spare his life.

Goku chooses to stay in heaven and competes in the heaven tournament where he comes to a stalemate with another warrior called Pikhan. While in heaven, Goku achieves the SS2 level and the SS3 level. Goku is able to come back to earth for a shot time, and while he was there, he met his second son Goten and entered in the Tenkaichi Budoukai Tournament. While in the tournament he notices strange things happening. Later on, he ends up fighting Majin Vegeta. They both were equal in strength at the SS2 level, but Vegeta ended up winning by cheating and knocks Goku out while he wasn't looking.
While Goku was on earth, he was able to fight fat Buu and show off his SS3 form. He didn't want to beat him; all he was doing was giving Trunks enough time to retrieve the Dragonball radar. Before Goku went back to heaven, he taught Goten and Trunks how to do the fusion dance.
While in heaven, Goku watched over what was going on with Buu and the others. During Gohan's fight with Buu, Dai-Kaioshin decides to give his life to Goku so he can go back to earth and fuse with Gohan using the potara earrings. When Goku teleports back to earth, Gohan ends up getting absorbed by Buu so Goku fuses with Vegeta instead. They both form into Vegitto and do battle with Buu. Vegitto is purposely absorbed by Buu so he can rescue everyone who was absorbed by him. The permanent fusion with Vegeta was canceled out when they were absorbed. While they were inside Buu, Goku and Vegeta rescued Gohan, Piccolo, Goten, and Trunks and in the process saved fat Buu (they don't take Fat Buu with them, but Buu spits him out later on). They all escape through one of Buu's blowholes and magically turn back to their normal size. When they removed Fat Buu, something started to happen to Buu. He turned back to his original form and when Goku and Vegeta challenged him, he destroyed the earth. Kaioshin was able to save Goku, Vegeta, Mr. Satan, and his puppy before the earth was blow away.
They were all transported back to heaven. While they were there, Buu went from planet to planet destroying them one by one killing all life that inhabited it. Goku and Vegeta decide to max their power so Buu would come to them and stop killing innocent people. Buu arrives and Goku is the first to fight. Goku battles hard, but his power starts to run low and he starts to loose. When Vegeta tries to fight him, he sees that he is no match for Buu. Goku saves Vegeta and continues to fight Buu. Then, Mr. Satan interferes with the fight and it is learned that Buu can't seem to harm Satan. Buu solves this problem by spitting out fat Buu (fat Buu was making it so Buu couldn't harm his friend, Mr Satan). Buu starts to fight fat Buu giving Vegeta and Goku a chance to devise a plan.
Vegeta comes up with the plan to use the Dragonball's to revive on earth, and all the people who were killed by Buu. His plan was for Goku to use a huge Genki Dama from the energy gathered from the people of earth and destroy Buu. After the wishes were made, Goku started to gather the energy to make the huge Genki Dama, but he was having a hard time convincing the people on earth to give up their energy. But when Mr. Satan asked everyone to raise their hands and give their energy, they did because they trusted him. After the energy was collected, Goku released the Genki Dama straight at Buu. But Goku's energy was low and he couldn't destroy Buu with it. As Buu started to push the Genki Dama back at Goku, Dende used the last wish from the Dragonball's and asked for Goku's strength to be returned. After he was healed, Goku easily destroyed Buu. Right before Buu's death, Goku wished that he would come back as a good guy so he could see who was really stronger.
Ten years later, Goku entered another Tenkaichi Budoukai tournament and tells everyone he has been watching someone with a great power. When they picked the numbers to see who would battle who, Goku had fat Buu rig the numbers so Goku would fight a young boy names Ubuu. Later on it is found out that Ubuu is actually the reincarnated Buu. In the middle of the tournament after he fought Ubuu, Goku leaves to train him
In Dragonball GT, Goku is turned into a child and goes on an adventure to find the black star Dragonball's with Trunks, and his granddaughter Pan. Once they return from their adventure, they find out that Bebi has been on a rampage while they were gone. Goku ends up reaching the SS4 form and defeats Bebi. After his fight with Bebi, he meets up with some of his old enemy's, Dr. Gero and Android 17. Dr. Mu Creates another 17 and the two 17's fuse becoming Super 17. With the help of 18, Goku defeats 17 with a dragon punch.
Shortly after, Goku finds out that the Dragonball are starting to crack. Seven evil Shenlong's appear and Goku and his crew fight them one by one. In the end, Goku absorbs the Dragonball's and flies off on the eternal Dragon.
Vegeta comes up with the plan to use the Dragonball's to revive on earth, and all the people who were killed by Buu. His plan was for Goku to use a huge Genki Dama from the energy gathered from the people of earth and destroy Buu. After the wishes were made, Goku started to gather the energy to make the huge Genki Dama, but he was having a hard time convincing the people on earth to give up their energy. But when Mr. Satan asked everyone to raise their hands and give their energy, they did because they trusted him. After the energy was collected, Goku released the Genki Dama straight at Buu. But Goku's energy was low and he couldn't destroy Buu with it. As Buu started to push the Genki Dama back at Goku, Dende used the last wish from the Dragonball's and asked for Goku's strength to be returned. After he was healed, Goku easily destroyed Buu. Right before Buu's death, Goku wished that he would come back as a good guy so he could see who was really stronger.
Ten years later, Goku entered another Tenkaichi Budoukai tournament and tells everyone he has been watching someone with a great power. When they picked the numbers to see who would battle who, Goku had fat Buu rig the numbers so Goku would fight a young boy names Ubuu. Later on it is found out that Ubuu is actually the reincarnated Buu. In the middle of the tournament after he fought Ubuu, Goku leaves to train him
In Dragonball GT, Goku is turned into a child and goes on an adventure to find the black star Dragonball's with Trunks, and his granddaughter Pan. Once they return from their adventure, they find out that Bebi has been on a rampage while they were gone. Goku ends up reaching the SS4 form and defeats Bebi. After his fight with Bebi, he meets up with some of his old enemy's, Dr. Gero and Android 17. Dr. Mu Creates another 17 and the two 17's fuse becoming Super 17. With the help of 18, Goku defeats 17 with a dragon punch.
Shortly after, Goku finds out that the Dragonball are starting to crack. Seven evil Shenlong's appear and Goku and his crew fight them one by one. In the end, Goku absorbs the Dragonball's and flies off on the eternal Dragon.
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