Summary: Sequel to Gaming the System Cast: Vincent Martella as Phineas Thomas Sangster as Ferb Ashley Tisdale as Candace Caroline Rhea as Mom Richard O'Brien as Dad Dan Povenmire as Dr. Doofenshmirtz Jeff "Swampy" Marsh as Major Monogram Tyler Mann as Carl Dee Bradley Baker as Perry Bobby Gaylor as Buford Maulik Pancholy as Baljeet Alyson Stoner as Isabella & Jenny Kelly Hu as Stacy Olivia Olson as Vanessa Guest Stars: will.i.am - Ferb (Singing Voice) Katy Perry - Jenny (Singing Voice)