Katie is a character in the Disney Channel series, Phineas and Ferb. She is one of Isabella's best friends and member in their Fireside Girls troupe.
Secondary Characters: Linda Flynn-Fletcher • Lawrence Fletcher • Isabella Garcia-Shapiro • Baljeet Tjinder • Buford Van Stomm • Major Francis Monogram • Jeremy Johnson • Carl Karl • Stacy Hirano • Ginger Hirano • Milly • Katie • Holly • Adyson Sweetwater • Gretchen • Vanessa Doofenshmirtz • Vivian Garcia-Shapiro Guest Characters: Santa Claus • Kim Possible • Pinocchio • Baby Baboon • Thor Odinson • Spider-Man • Hulk • Iron Man • Red Skull • Nick Fury • Venom • Whiplash • MODOK