- Vincent Martella (Phineas Flynn (voice))
- David Errigo Jr. (Ferb Fletcher (voice))
- Ashley French (Candace Flynn (voice))
- Caroline Rhea (Linda Flynn-Fletcher (voice))
- Dee Bradley Baker (Perry the Platypus (voice))
- Alyson Stoner (Isabella Garcia-Shapiro (voice))
- Dan Povenmire (Heinz Doofenshmirtz (voice))
- Jeff 'Swampy' Marsh (Francis Monogram (voice))
Phineas and Ferb — S3E53
Episode: Doofapus
Air Date: 2012-07-06
Runtime: 11 min
Overview
Candace accidentally turns into a fluid when she comes into contact with a device that turns solids into liquids. Meanwhile, Doofenshmirtz turns himself into a platypus to defeat Perry in battle.