Transform into Super Saiyan
He is the son of King Vegeta. Vegeta is known as a super powerful Saiyan. Along with Goku and Nappa they are the two last surviving Saiyans. Nappa and Vegeta travel to Earth to destroy all life and sell the planet. He's a fierce competitor of Goku's that's always trying to reach higher power levels than Goku. That is the reason that Vegeta first turned into a Super Saiyan. Very focused, he dreams of the Dragon Balls to wish for gaining immortality. He is determined to destroy Frieza for killing his home planet and torturing him. After the Namek Saga he changes sides and fights for the good guys.
Vegeta trains incredibly hard for the Cell Games, staying in the Time Chamber for a full 2 days! Although Vegeta does not really fight Cell. In the Buu Saga, Vegeta allows evil to once again take over his conscience, and he fights Goku in the battle he has waited for his whole life. He knocks Goku unconscious, and runs off to fight Buu.