Operation Crumb Cake

"Operation Crumb Cake" is an episode of Phineas and Ferb. It aired on July 14, 2014.

Plot
Isabella unintentionally admits her feelings for Phineas in a letter so her and the Fireside Girls have to grab the letter before Phineas reads it. Meanwhile, Doofenshmirtz invents the Unretrograde-inator to help change his misfortune.