Hide and Seek

Candace tries to bust her brothers when, to play a game of indoor hide and seek, Phineas and Ferb shrink down their friends including their new extreme fan, Irving. Meanwhile, Dr. Doofenshmirtz attaches a nanobot to Perry in an attempt to discover where he lives, and seeing Phineas, Ferb, Isabella, Buford and Irving while doing so.

Songs

 * When You're Small

The "Too Young" Line
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Whatcha doin'?
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Perry's entrance to his lair
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Background Information

 * A clip from the movie that Phineas and Ferb watched in "Does This Duckbill Make Me Look Fat?" was shown in this episode.
 * Dr. Doofensmirtz uses the word "greevil" again. ("De Plane! De Plane!")
 * When Perry returns home, his theme song plays the same way it did in "Put That Putter Away".
 * When Perry comes home, his food dish is yet a different color, silver, then it was in "Oh There You Are Perry".
 * This is the third time Phineas and Ferb are seen in their swimming suits: the first being in "Lawn Gnome Beach Party of Terror", the second in "The Lake Nose Monster".
 * Irving's scrapbook on Phineas and Ferb's adventures contains pictures from "Rollercoaster", "Greece Lightning", and "Chez Platypus".

Allusions

 * Honey, I Shrunk the Kids: When Candace was in the grass, she experiences the same hardships and attacks that the children did in the film Honey I Shrunk the Kids. Later, they fly on a bee, like in the movie.
 * Star Wars Episode V: The Empire Strikes Back: Baljeet survives frigid conditions by cutting open a fly and stashing away inside of it, the way that Luke Skywalker did in this film. Also, the kids conquer Doofeshmirtz's robot by harpooning string around it, the same way Imperial AT/AT Walkers were destroyed by the rebel forces.
 * Romeo and Juliet: The line "Wherefore art thou, Perry?" is an allusion to the famous Romeo and Juliet balcony scene.
 * Moby Dick: During the song "When You're Small" one line says that when you're small "your goldfish is a great orange whale." The "Great White Whale" was the name used for the whale in Moby Dick. Also, while this line is sang, Ferb is shown dressed as Captain Ahab.
 * Freakazoid!: Irving is a fan of Phineas and Ferb and wants to go with them on their adventures kind of like Fanboy who is a fan and wants to go on Freakazoid's adventures.

Cast

 * Vincent Martella as Phineas
 * Ashley Tisdale as Candace
 * Thomas Sangster as Ferb
 * Alyson Stoner as Isabella
 * Bobby Gaylor as Buford
 * Caroline Rhea as Mom
 * Dan Povenmire as Dr. Doofenshmirtz
 * Jeff "Swampy" Marsh as Major Monogram
 * Dee Bradley Baker as Perry
 * Jack McBrayer as Irving