Similar to the mash up with the Marvel Comics characters, Disney has announced at Comic-Con a Phineas and Ferb Star Wars animated special.
Phineas and Ferb meet the Marvel characters August 16th in Phineas and Ferb: Mission Marvel, and now they will be placed on Tatooine in the Star Wars Universe.
Dan Povenmire and Jeff Marsh, the creators of Phineas and Ferb, made the announcement at the Comic-Con describing the new mash up with Star Wars as follows (via Deadline):
Phineas and Ferb are living happily on Tatooine, just one moisture farm over from Luke Skywalker. The love simply hanging out and creating new adventures under the twin suns but find themselves thrust into a global rebellion when the plans for blowing up the Death Star accidentally fall into their hands.
The episode is due to air in 2014.