Phineas and Ferb: The Klimpaloon Ultimatum

Isabella sends a letter to Phineas admitting her true feelings but instantly regrets her decision and desperately tries to get it back. Meanwhile, Doof invents an Unretrograde-inator to reverse his bad luck./ Doof invents an "-inator" to disguise himself as the local pizza delivery boy in an effort to get warm pizza, but Candace gets hit by the ray and uses her new delivery boy appearance to find out what makes boys tick.