Phineas and Ferb and His Friends experiencing an allergic reaction to TBA and They Also Encountered Their Deep and High Voices of Their Own While Trying To Bulid a Invention, Candace Encounters her allergic reaction again, Stacy and Jenny experiencing Their allergic reaction too. They All Need to Figure Out to Get Rid of Their allergic reactions to TBA (Candace: Wild Parsnips, The Others: TBA) Cast: Vincent Martella as Phineas Ashely Tisdale as Candace Thomas Sangster as Ferb Alyson Stoner as Isabella and Jenny Mitchel Musso as Jeremy Dan Povenmire as Dr. Doofenshmirtz Kelly Hu as Stacy Guest Stars: