Phineas and Ferb the Movie: Across the 2nd Dimension.Phineas and Ferb are celebrating the fifth anniversary of when they got their pet platypus, Perry. In commemoration, they create a giant shuttlecock and robotic replica figure of Perry to play an improvised game of badminton. However, when Perry's hovercraft accidentally collides with their shuttlecock, the boys crash into Dr. Heinz Doofenshmirtz's laboratory and destroy his "Other-Dimension-inator", which is designed to help him travel to parallel dimensions. Intrigued by the idea, the two help Doofenshmirtz rebuild the machine, while Perry arrives on his mission to stop Doofenshmirtz. Unwilling to give away his secret identity to the boys (which would get him relocated to another family), Perry reverts to his pet mode and is forced to watch them help Doofenshmirtz activate his invention...