Disney XD will premiere a two-part time travel episode and a viewers' choice countdown special. The announcements were made on July 26 at Comic-Con.
Entitled "Phineas and Ferb's Quantum Boogaloo," the two-part episode features guest stars Jennifer Stone (Wizards of Waverly Place), Moises Arias (Hannah Montana) and Jennifer Grey (Dirty Dancing), and will include a new extended version of the series' main title theme song by Grammy-nominated artists Bowling for Soup.
During the show, which will also air on Disney Channel, Phineas and Ferb travel to the future to find a tool that hasn't been invented yet. There they encounter future Candace who follows them back through time and finally busts her brothers as they are building their rollercoaster, but also accidentally foils Agent P's defeat of Dr. Doofenshmirtz, setting off a chain reaction that turns the future into a dystopian society.
As of Sept. 4, fans of the music-filled series, which has featured over 100 original songs, including the Emmy-nominated "Ain't Got Rhythm," will be invited to vote for their favorite musical numbers to be showcased in a new viewer-generated special episode entitled "Phineas and Ferb Musical Cliptastic Countdown" to premiere in October 2009.
Hosted by comedic foils Dr. Doofenshmirtz and Major Monogram, the episode will feature a compilation of the Top 10 favorite music clips selected by fans. Global voting begins Sept.1 at DisneyChannel.com and DisneyXD.com.