Thaddeus, Thor, Jessebel the Waterfront Girls kidnap Phineas, Ferb, and the Fireside Girls, and attack the city. Now it's up to Isabella to rescue her friends. In this game their are some actions Isabella can't do on her own, so she must rescue a certain amount of Fireside Girls to perform them, including taking on Thaddeus' brutal Waterfront Girls. But watch out, don't let Thaddeus' goons capture your girls. It will take as many Fireside Girls as possible to stop Thaddeus and save Phineas and Ferb.