Phineas and Ferb build a teleportation device which switches Candace's and Perry's bodies, and now they have to change them back.
Meanwhile, Dr. Doofenshmirtz has a grudge against a certain company mascot and Perry has to stop him, eventhough Perry is in Candace's body.
- Animal Gender Bender: Candace (in Perry's body) "sweats milk".
- All Women Love Shoes: Doofenshmirtz tries to take advantage of this stereotype when fighting Perry who is in Candace's body. He tries to distract him (her?) by saying "Look, a shoe sale!" before running away. Oddly enough, it works.
- Baleful Polymorph: Candace gets turned into a platypus.
- "Freaky Friday" Flip: Perry and Candace switched bodies because of the teleportation device.
- Talking Animal: Candace when she switched bodies with Perry (the Platypus).
- Teleporter Accident: How the A-plot came about.
- Wouldn't Hit a Girl: Dr. Doofenshmirtz refuses to fight Perry in Candace's body because of this.