You could of just gone to www.imdb(dot)com (internet movie database)
Anyways Tyler Alexander Mann plays Karl
Vincent Martella plays Phineas and Thomas Sangster plays Ferb.
Allison Stoner plays Isabella's voice in Phineas and Ferb.
Bobby Gaylor plays Buford in Phineas and Ferb love that show!
If you mean the voice of Phineas on Phineas and Ferb, then Vincent Martella.
Richard O'Brien plays Lawrence Fletcher (Flynn) on "Phineas & Ferb"
Carl. Carl is quote 'an unpaid intern' 'working for college credits.'
Tyler Mann
Piper's Picks TV - 2008 Carl the Intern Phineas and Ferb's Tyler Mann 1-41 was released on: USA: 5 June 2010
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.
carl!
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.