Based on Phineas and Ferb (created by Dan Povernmire and Jeff "Swampy" Marsh) and T.U.F.F. Puppy (created by Butch Hartman). It's summer vacation again, and Phineas and Ferb Flynn-Fletcher and their sister Candace, who turns over a new leaf and no longer tries to bust her brothers constantly, have discovered a strange portal to a different world with animals instead of humans. They go through the portal and end up in a city called Petropolis where they meet and befriend Dudley Puppy and Kitty Katswell from T.U.F.F. (a.k.a. Turbo Undercover Fighting Force) who fight crime and the forces of evil. Phineas, Ferb, and Dudley are like a trio now, and Candace & Kitty are like sisters together. After Mrs. Flynn-Fletcher gets kidnapped by Snaptrap and his gang, Phineas, Ferb, and Candace help Dudley & Kitty rescue her and bring Snaptrap and his gang to justice, and they become new T.U.F.F. agents and Dudley & Kitty's new partners. Later on, they take Perry the Platypus with them to Petropolis, and in the animal world, he talks! 25 episodes, 3 acts each.
