Phineas Flynn is a Saiyan from Earth. He is the sister of Candace Flynn, a martial arts master and celebrated healer, the stepbrother of Ferb Fletcher and the stepson of Lawrence Fletcher. Originally thought to be a human, he and Ferb discover they are actually members of an alien race known as the Saiyans, reputed as the most powerful warriors in the universe. He, along with Ferb and his battle partner and love interest Isabella Garcia-Shapiro are the main characters of Phineas and Ferb Z.