Phineas and Ferb become the galaxy's unlikeliest last hope when they must return the Death Star plans to the Rebel Alliance. Phineas and Ferb become the galaxy's unlikeliest last hope when they must return the Death Star plans to the Rebel Alliance. Phineas and Ferb become the galaxy's unlikeliest last hope when they must return the Death Star plans to the Rebel Alliance. Phineas and Ferb become the galaxy's unlikeliest last hope when they must return the Death Star plans to the Rebel Alliance.