Like Goku, Vegeta too is a Saiyan...the Prince of All Saiyans. At the end of the first season, Goku defeated Vegeta on Earth. Vegeta returned as an enemy in the second season. By the end of the second season, he, like Piccolo changed to join the Z Fighters and fight for justice. However, he always looks to fight Goku to settle the score of who is strongest.