Doof Dynasty

Today, Phineas and Ferb are in another world again: A world in which princess Isabella is kidnapped. Phineas and Ferb must save her from the evil Doofus Khan.

Background Information

 * This episode was first mentioned on the German schedule for Disney XD on September 17th, 2011 and was first known as the Unnmaed Ancient Chinese Episode.

Continuity

 * Third episode having the word Doof in its title ("The Doof Side of the Moon", "Hail Doofania!")
 * Doofenshmirtz is evil against Phineas and Ferb again ("Wizard of Odd"; "Phineas and Ferb The Movie:Across the 2nd Dimension")
 * Phineas and Ferb meet alternate versions of other characters again("Phineas and Ferb The Movie: Across the 2nd Dimension")