Undercover Katherine

The thirty-fifth episode of Season 37. After Katherine hears Doofenshmirtz is making a machine that will transport her to another dimension, Katherine goes to Doof's place to investigate. Phineas and Ferb play giant basketball. There's a silly song break included.

Episode Summary
Phineas and Ferb are finishing inflating a really big basketball. Isabella comes over and wonders what they're doing. They're going to play giant basketball. Buford is totally in for it. Baljeet isn't quite sure. Irving is totally up for it. Heidi offers to ref the game. Phineas agrees with it. Meanwhile, with Katherine, she's sitting at home, watching a movie about a video game villain transporting to different games. Then, an alarm goes off. It's her Doofenshmirtz alarm. She goes to Doof's HQ to see what the dilly dally is. When she arrives, she hides behind a tattered Sandwich-Suit-Remove-Inator. Doof is humming a song as he's building an Inator. He says to himself he can finally rid himself of that bratty girl by transporting her to another dimension. Katherine gets scared. Then, it cuts to the silly song break. After the silly song, it shows Phineas and Ferb, starting to regret giant basketball. Baljeet has already had 27 injuries, Irving went unconscious 13 times, and Buford had a strange craving for something stinky 4 times. Back at Doof's, Katherine is thinking about making a move on Doofenshmirtz. She decides to surprise attack him. She secretly blows up his Inator too. Doofenshmirtz wondered if it was Perry. To his surprise, he sees brunette hair and a black tanktop. He realizes it's Katherine. Doofenshmirtz needs to start planning his big, huge, final attack on her. With the boys, all of Phineas and Ferb's friends are flattened, even Heidi. Phineas totally regrets this idea.

Songs

 * Pizza Angel (from Minnesota Cuke and the Search for Samson's Hairbrush)

The "Too Young" Line

 * Katherine: "Think about Katherine, aren't you a little young to be spying?" *brief pause* "Nah!"

Ferb's Line
"Let's never do this again"

Whatcha Doin
Isabella

Perry's entrance to lair
None seen

Evil Jingle
Doofenshmirtz Evil Incorporated!

Continuity

 * Seventh time Doofenshmirtz does something against Katherine ("Katherine v.s. Doofenshmirtz", "Believe In Myself", "Amanda's Inside Story", "The Chronicles of Irving", "Katherine's Last Stand", "Bailey Strikes Gold")
 * The Sandwich-Suit-Remove-Inator is seen ("Boyfriend From 27,000 B.C.")
 * Doofenshmirtz makes another dimension related Inator ("It's A Mud, Mud, Mud, Mud World", "Vanessacary Roughness", "Phineas and Ferb The Movie: Across the 2nd Dimension")
 * A picture of Katherine and Baljeet on the ice cream rocket is seen in Katherine's bedroom ("Perry's Biggest Mission Yet")

Allusions

 * VeggieTales: A silly song from the show is used
 * Wreck-It Ralph: Katherine is watching this movie
 * Donkey Kong: When Katherine is watching the movie, it plays some of the movie's score with sound effects from Donkey Kong