 The film concerned Phineas and Ferb accidentally helping Dr. Doofenshmirtz with an invention of his, which takes them to a parallel dimension.There, Perry reveals his double life as a secret agent to them, and, to save their friends from an alternative Dr. Doofenshmirtz, who is far more devious and threatening than his prime counterpart, they team up with their alternate dimension selves to stop him.On January 11, 2011, Disney Channels Worldwide chief Gary Marsh announced that a theatrical "Phineas and Ferb" feature-length film was in development by "" producer Sean Bailey.