Brolly, he was born on the saiya-jin homeworld with Goku. Their cribs were placed next to each other. While Brolly was
             born with a power level of 10,000 and Goku had a meager power level of 2. When they were babies Goku managed to make
             Brolly sad and cry with Goku's persistent whining that wouldn't stop. This is what drove Brolly's anger towards Goku,
             Goten, any other dbz warrior and his love of being evil. Please stop reading here if you do not want to further spoil the
             storyline/endings of movies 8,10, and 11.

                 While Brolly was a baby, King Vegeta learned of this child of Paragus that was born with amazing power for a child. King
             Vegeta had both Paragus and Brolly "thrown away" like trash. When Freeza destroyed the planet, Brolly used his amazing
             power to protect both himself and Paragus from the destruction.

                 During Brolly's childhood Brolly became increasingly difficult to control, Brolly's power was greater than ever imagined.
             Paragus had a scientist from a world he conquered create a devise to control Brolly, similar to a remote control of sorts.
             When Paragus essentially had this great power at his control, he created a "New Planet Vegeta" in an attempt to draw the
             Saiyan Prince(Vegeta) to the new world where Paragus would have his revenge on King Vegeta by killing his son Vegeta by
             either the comet that was heading towards the new planet or by Brolly himself.  The plan did not work completely as
             planned and Paragus told Vegeta of the Legendary Super Saiya-jin who was near the new world that was destroying entire
             galaxies. This is what made Vegeta go to the new world.

                 The rest of Paragus's plan seemed to be working accordingly, but the arrival of Goku at the new world shortly after Vegeta
             caused problems. Seeing Goku, drove Brolly's anger and eventually Brolly could not be controlled by Paragus 's device and
             his plan was revealed to the saiya-jins. Paragus tried to escape from the planet before it's eminent destruction but Brolly
             destroyed his space pod, with Paragus in it, killing him.

                 Through a very long and rigorous fight, Goku did finally defeat Brolly in movie 8 with the help of the others (Piccolo,
             Gohan, Trunks, and Vegeta). Brolly returns in Movie 10, somehow he survived Goku's deathblow and managed to get to
             another space pod, this space pod lands on earth. There is another battle, Goten and Gohan use a large Kame-hame-ha to
             defeat Brolly. At first there is no effect but Goku's spirit falls from the clouds and gives them emotional support as well as
             joining in on the Kame-hame-ha which does destroy Brolly. Finally he returns one last time in movie 11, he is cloned and is
             once again destroyed by Chibi (young non-future) Trunks and Goten.