Vegeta is the Saiyan Prince in the Series, Dragon Ball Z. He was a coldhearted killer but when the series progressed Vegeta became more down to Earth. Vegeta was a slave of Frieza for half of his life. He followed every order of the evil tyrant and in the end Frieza betrayed him. Vegeta had craved the power of a Super Saiyan, he finally got what he wanted in after Frieza's defeat. He had became a Super Saiyan. Vegeta is Goku's rival because Vegeta was defeated by Goku when he was on Earth. Vegeta vowed to get revenge so he is Goku's rival, but they are also good friends.