Vincent Martella and Thomas Sangster
Walt Disney provided Mickey Mouse's voice for all animated shorts from 1928 to 1947, including Steamboat Willie.
The cast of Phineas and Ferb would include the main characters who are Vincent Martella who does the voice of Phineas, Thomas Brodie-Sangster who does the voice of Ferb, Ashley Tisdale who does the voice of Candace, Dan Povenmire who does the voice of Dr. Heinz Doofenschmirtz, Caroline Rhea who does the voice of Phineas and Ferb's Mom, ) Jeff Marsh who does the voice of Major Monogram and Dee Bradley Baker who does the voice of Perry the Platypus, the secondary characters who would include Alyson Stoner who voices Isabella, Mitchell Musso who voices Jeremy, Maulik Pancholy who voices Baljeet, Richard O'Brein who voices Phineas and Ferb's Dad, Tyler Alexander Mann who voices Carl, Kelly Hu who voices Stacy, Bobby Gaylor who voices Buford, Olivia Olsen who voices Vanessa and Kari Wahlgren who voices Little Suzy.
No, they are just make believe cartoon characters. who are drawn out by artists and voices played by actresses
Mike Judge
Phineas is played by Vincent Martella.
It's Hank Azaria, and it's The Simpsons.
"The Simpsons"
The voices of cartoon characters change over time.
maybe he got tired of drawing all the characters himself and doing the voices
Allyson Stoner voices Isabella on Phineas and Ferb.
Caroline Rhea is the actress that does the voice of Phineas and Ferb's Mother.
Alyson Stoner