Broke Up

This is the last episode of season 21.

When Isabella and Baljeet broke up, Phineas sees his oppotunity to get a date with her, meanwhile, Buford helps Baljeet with his break, in parallel, while Phineas is going to progress in their relationships, Ferb tryes to filter through the Scouts, in parallel, Perry helps Doofenshmirtz when he believes that an alien invasion is coming to his building.