Phineas decides to build a whole city of corndogs for Ferb's birthday. Phineas asks his friends to take turns helping him and keeping Ferb occupied. Phineas starts building his city on the outskirts of Danville as Baljeet takes Ferb to Math-A-Palooza. Ferb walks off after getting bored by Baljeet. Baljeet notices him running off and tells him that they could go see a movie. Ferb agrees, but gets mad at Baljeet when he buys tickets for Mathablanca. While Baljeet gets refreshments, Ferb leaves the theatre and starts heading to the beach, where Phineas is buildinng part of the city. Isabella who had run off to get a drill, sees Ferb and chases after him. She asks Ferb if he wou;d do something with her. Together, they go to the Unicorn Convention. As Isabella is buying a unicorn sticker book,