In the special episode Phineas and Ferb are living happily on Tatooine near Luke Skywalker when the plans for blowing up the Death Star accidentally fall into their hands!
Complicating matters, Candace -- the boys' sister -- has a Stormtrooper-like intent on "busting rebels" who chase Phineas and Ferb across the galaxy in hopes of retrieving the Death Star plans.
That's all we'll say here...no need to spoil the surprises, but if you really want to know more, you could read the synopsis posted on StarWars.com
For US audiences the special will premiere on Disney Channel July 26th, 2014.
And here's the official trailer...May the Ferb be with you!