High Quality Content by WIKIPEDIA articles! Phineas Flynn is the main protagonist of the animated television series Phineas and Ferb. Voiced by Vincent Martella and created and designed by Dan Povenmire, Phineas first appeared along with the rest of the series` main characters in the pilot episode "Rollercoaster." Phineas, along with his stepbrother Ferb Fletcher, star in each A-Plot of every episode.