Phineas and Ferb the Movie: Across the 2nd Dimension (2011)
Storyline: Perry’s worst fear comes true when Phineas and Ferb find out that he is in fact Secret Agent P, but that soon pales in comparison during a trip to the 2nd dimension where Perry finds out that Dr. Doofenshmirtz is truly evil and successful.
Directors: Robert Hughes, Dan Povenmire
Writers: Jon Colton Barry, Dan Povenmire, 16 more credits.
Stars: Vincent Martella, Ashley Tisdale, Thomas Brodie-Sangster …
More infor: IMDB