Journey to the Center of Candace

Phineas and Ferb create a mini-submarine and try to retrieve Isabella's sash from Pinky's stomach. But, Pinky runs off to chase a cat and Candace accidentally eats it with her siblings in the Mini-sub in it. To try to get out, They use Candace's body nerves to hang upside-down on a nearby playground's monkey bars so Candace will spit them out. But then, Candace takes control and gets off the bars.

Meanwhile, Perry is entering Doofenshmirtz's abondened warehouse and they both decide to "Mix it up a little". So Doofenshmirtz tells Agent P his plan before he captures him. He creates the "Make-up-your-mind-inator" so people will just decide what they have to do. Then, Perry remembers that at breakfast, Phineas and Ferb said they could'nt make up their minds about they were going to do that day. Perry then cuffs Doofenshmirtz to nearby pipe, and then calls Monogram to come capture him. While they are waiting, Doofenshmirtz tricks Perry by saying there is pocket chess in one of two nearby handbags, but there is actually a self-attaching belt that sticks itself to any surface.Then, Dr. Doofenshmirtz frees himself and uses a demonstration of what just happened to Perry and traps himself.

Phineas and Ferb, inside Candace, are heading to Jeremy's Uncle's sandwich shop. They start making Candace cough so they will be coughed out. Jeremy goes to get water, and they get coughed out and return to normal size. Then, Isabella returns with her sash, Pinky had spit it out.

Then Perry and Doofenshmrirtz chase on the rooftop, Perry frees himself from the belt, and then kicks Doofenshmirtz off the building and he falls into the sub, his shoulder hitting the shrink button, and the sub falling into the grilled cheese Jeremy brings and named after Candace. But then, Pinky eats the sandwich, trapping Doofenshmirtz inside him.

"(Phineas, traveling with Ferb inside Candace): Hey, Candace is on a date with Jeremy! Wait... That means we're on a date with Jeremy. Ferb: That's creepy on so many levels"