Phineas and Ferb the Movie: Across the 2nd Dimension

 is an upcoming about the TV series Phineas and Ferb, that has a planned release date for August of 2011. It was first announced by Jeff "Swampy" Marsh during a January 2010 interview with the Daily Telegraph.

Short Summary
Phineas and Ferb discover that their beloved pet platypus, Perry, is really a secret agent who battles the forces of evil daily. The boys team up with Perry on a grand adventure through a parallel universe where they must ultimately thwart an even more evil version of Dr. Doofenshmirtz.

Songs
Everything's Better with Perry 

Some Mysterious Force (written for but not used).

Background Information

 * Dialogue for the movie began recording the week of April 26, 2010.
 * Preliminary storyboards for the special, including the opening song "Everything's Better with Perry," were shown at Comic-Con on July 25th, 2010.

Allusions

 * The title satirizes the recent trend of movies (in particular computer-animated ones) being filmed and released in 3D and advertised as such, which can be compared to a similar craze for live-action 3D movies in the 1950s (though with much less advanced 3D technology).