Hide and Seek

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

Episode Summary
Linda tells Phineas, Ferb, Isabella, Baljeet and Buford that she will be going over to Vivian's house for a while. Buford asks what sort of fun they could have while it's raining, and the gang seems stumped. Irving suggests Hide and Seek, which surprises everyone. Irving then proceeds to say that he is their biggest fan and shows off his photo album of their Big Ideas. Phineas agrees that this is a good idea, but Buford states that the house is too small for a good game of hide and seek. Ferb suggests that instead of the house being too small, they are too big. This gives Phineas an idea and says, "I know what we're going to do today!" This excites Irving and then asks if he can say, "Where's Perry?" This confuses Phineas, and later frightens him a little as Irving tries to say the line in dramatic fashions.

Meanwhile, in Perry's underground hideout, Major Monogram informs Perry about a series of disturbing messages Doofenshmirtz has left on his answering machine, asking for Perry to come over to stop him from being evil. Monogram tells Perry to stop him while other messages continue to play in the background.

Phineas and Ferb finish their shrinking machine and has everyone touch the red ball on the top of it. Everyone starts examining the world from their new size, starting a montage to the tune When You're Small.

Perry barges in on Doofenshmirtz, whose evil deed for the day is throwing recyclables out in the regular garbage. He says he has seen the evil of his ways and starts to pat Perry on his back to shoo him home. In doing so, he plants a minibot on Perry's back, without him knowing about it.

Phineas declares Candace as it, and everyone hides. Candace, meanwhile, is talking to Stacy on the phone and doesn't notice the gang. She does, however, spot the shrinking machine and rushes to take it to Linda across the street. She picks up an umbrella, which Baljeet is hiding on, and flings him up onto the light fixture. Phineas tries to think of a way to get the shrinker back, and Irving is disappointed when he learns that his heroes are just improvising the whole time. Baljeet feels the chill of the air conditioner blowing down on him.

Perry returns home and goes to sleep on his pet bed. The minibot comes alive and Dr. Doofenshmirtz steers it in the hopes of finding Perry's address somewhere.

As Candace crosses the street, it stops raining. She knocks on the Garcia-Shapiro front door, but accidentally activates the shrinking machine on herself. Vivian answers the door immediately afterward, seeing only the device and takes it inside. Candace then faces the horrors of the front lawn.

The minibot spots the children, but Doofenshmirtz thinks the signals got crossed since they look regular sized. He loses control of the robot, and it chases after the children. They use a sewing basket to tie threads over it and pull it down onto the ground. Ferb reprograms the remains of the bot to be a mini-fly, and Irving takes the opportunity to get a photo of himself with the gang. They go to rescue Baljeet, who survived by hiding in a dead fly's corpse.

Candace is saved from Pinky by Isabella and helped on board the mechanical fly. They soar over to the machine and return to their normal sizes. Candace then runs off to show Linda the inventions.

Doofenshmirtz regains video feed, and Perry spies the camera watching him. He crushes it, which prompts Doofenshmirtz to activate the self-distruct button on his bot. It destroys the shrinker with it, somehow leaving the table and the rest of the kitchen unharmed. Doofenshmirtz comments on feeling empty that he has no come-uppance at the end of this adventure.

Songs
When You're Small

The "Too Young" Line
None.

Whatcha doin'?
None.

Perry's entrance to his lair
None.

Continuity

 * A clip from the movie that Phineas and Ferb watched in "Does This Duckbill Make Me Look Fat?" was shown in this episode, during the song "When You're Small".
 * Dr. Doofenshmirtz 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 silver, rather than what 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".
 * Phineas mentions the shrinking technology they used for their submarine adventure. "Journey to the Center of Candace"

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 the film inside a Hoth creature. 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 sung, Ferb is shown dressed as Captain Ahab.
 * Pirates of the Caribbean: The music that plays while the gang are tying down the robot bug is reminiscent of the main theme from the movie.
 * Freakazoid!: Irving wants to join in on Phineas and Ferb's new adventure just like Fanboy really wanted to go on Freakazoid's adventures sometime he can drive him crazy.
 * Indiana Jones: Phineas saves Isabella swinging on a "whip", with similar music.

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