The person who plays Vanessa is Olivia Olsen
Vincent Martella plays Phineas and Thomas Sangster plays Ferb.
Maulik Pancholy plays Baljeet on Phineas and Ferb.
Mitchell Musso plays jeremy on Phineas and ferb!
Allyson Stoner voices Isabella on Phineas and Ferb.
Phineas is voiced by Vincent Martella.
Phineas Flynn as Vincent Martella and Ferb Fletcher as Thomas Sangster.
Allison Stoner plays Isabella's voice in Phineas and Ferb.
He plays Phineas Flynn in the series and in Phineas and Ferb: Across The Second Dimension.
Vincent Martella is the voice of Phineas Flynn on Phineas and Feb.
He voiced by Thomas Sangster
Jeff "Swampy" Marsh is the voice of Major Monagram on Phineas and Ferb.
Phineas Flynn-Vincent Martella Ferb Fletcher (step brother)-Thomas Sangster