I saw Phineas and Ferb The Movie: Across The 2nd Dimension (2011). Starring the voices talent of Ashley Tisdale (The Suite Life On Deck), Mitchell Musso (Hanna Montana) and Alyson Stoner (Step Up 3D).
Phineas and Ferb discover that Perry is a secret agent, and they all get stuck in an alternate dimension where Doofenschmirtz is the ruler of the tri-state area.
I give this movie 4/5 stars.