Phineas and Ferb's Quantum Boogaloo

Episode Summary
Phineas and Ferb are in the backyard with Bailjeet, making a "superstructure." Phineas says they need a tool that fuses metal and wood, which is only availble 20 years into the future. Bailjeet reveals his formula for time travel, which is not yet perfected. Phineas suggests the museum time machine used in It's About Time! Bailjeet leaves angry at missing the fun from that episode. The boys and Isabella, who was just entered, leave for the museum, with a somewhat insane Candace following them. There, they leave, with Candace staying behind to bust them when they return. In the future, Phineas leaves Isabella with the time machine, claming she's "the only one they can trust." However, about a minute later, Isabella, in a fit of lovestruck absentmindness, leanes against the Machine leavor, saying "He trusts me!" right before leaving for the past. Phineas surveys the changes made to Danville before spying a older, calmer Candace, along with Amanda, Xavier and Fred in the backyard. Amanda complains about how Xavier and Fred are wasting their summer vacation, then complains to Candace that the boys never do anything. Phineas and Ferb talk to their future nephews, and are disappointed by their lack of imagination of what to do with their vacation and offer suggestions. Xavier and Fred decide to build bumper cars that travel in the 5th dimension, and give Phineas a wood-metal fuser. Candace spies the young Phineas and Ferb while talking to Stacy, who will have become the president of Uruguay and goes to spy on them. When she gets spotted, she runs to get future Linda in order to bust the boys. Isabella returns to the future, displaying various time-travel souvenirs as the boys climb in. Future Candace drags Future Linda through the museum, but Linda gets distracted by an old bone and misses the time machine disappearing. Back in the present, a parallel scene unfolds with present Candace and Linda. Professor Onassis arrives in the future with his time machine and decides to settle in this time period, while Candace borrows it to go to the day of the roller coaster to bust Phineas and Ferb. Just as Candace screams at the barren pillar, future Candace takes Linda outside so she can see the rollercoaster for herself. Linda freaks out and starts making calls to get Phineas and Ferb off the ride. This has the side effect of causing the helicopter which Perry had used to lift the giant magnet to deviate course, making Perry miss with the grappling hook and get hit by the giant ball of tin foil while Doofenshmirtz jumps to the lower roof of his building. Linda yells at Phineas and Ferb for their reckless acts, and future Candace returns to her time, satisfied with her work. However, that joy is short lived as she notices the bleak world she's in. It seems that Phineas and Ferb getting busted caused outraged parents to overreact and remove anything creative and fun, eventually child-proofing children. This, and Perry being in a body cast for 18 months, allowed Doofenshmirtz to take over and become emporer. Among his various edicts are that everyone must wear lab coats, their names are changed to Jo(e), and they must bask in his glory when passing his statue. Candace then returns to the past, stops herself from barging into the supermarket to bust her brothers and both older Candaces hide behind a car. The Candace who ended up in the dystopia tells her slightly-younger self about the future, and they agree to stop altering the past. They also find out how the rollercoaster got cleaned up. They rush to the time machine to return to the future, but it gets smashed by the giant tin foil ball. Figuring Phineas and Ferb are their only hope of returning home, they go to the backyard after Linda sees the boys under the tree but before the tree explodes. Phineas is shocked at there being two mature Candaces, and they explain their situations. Phineas points out that, since the bad future will no longer happen, that Candace should cease to exist, which immediately happens. Phineas, Ferb, Isabella and future Candace go to the museum to fix the time machine that's still sitting there, and young Candace follows behind. She tries to convince future Candace to come back with her to bust the boys, but she explains that she no longer has any interest in busting them. Disappointed, she tags along in the time travel to the future. In the future, Candace triumphantly rushes to find Linda, being the only proof she needs to bust Phineas and Ferb. The boys and Isabella follow to maintain the time-space continuum. Linda is shocked at Candace being so young, while the children are shocked at Linda's oldness. Young Candace is disappointed that the boys receive no punishment, but settles for the fact that the boys were, indeed, busted. At the museum, before returning to the present, future Candace gets the boys to promise never to time travel to the future again. Isabella disappears for a brief while, reappearing later in the time machine with a soda. Amanda then mentions how Isabella looks like her aunt, which she takes to mean she marries Phineas, but Candace points out she might marry Ferb. The boys go home, and we get a brief look at the hyper-dimensional bumper cars. In the present, Candace declares that, now knowing the boys can be busted, she will never stop trying to do so. During the closing credits, Isabella travels back in time to just after Phineas decides to travel to the future and stops them by giving them the wood-metal fuser they needed. Phineas offers her a soda, which she accepts and vanishes. Phineas points out that now they don't need to travel to the future.

Songs

 * Second verse of the extended verson of Today is Gonna Be a Great Day
 * It's a Charmed Life!

Whatcha doin'?
Said by Isabella as she enters the backyard in the present.

Perry's entrance to his lair
None.

Background Information

 * The episode features the second verse of the extended version of the theme song.]
 * Jennifer Stone, Moises Arias and Jennifer Grey will be credited in this episode.
 * A clip of this episode was shown at Comic Con 2009
 * This episode will air on September 21st according to xdmedianet.com. ]
 * This episode was leaked onto Youtube on the 19th of September.
 * Phineas is more aware of the name of things around him, as he says the name of the museum they needed to go to, and in the future, he and Ferb know Bowling For Soup and even says the name of the band to Xavier and Fred.
 * This conforms that in the present, Phineas and Ferb 10.
 * Anybody Phineas' size can get on a rollercoaster. How would Linda know that Phineas actually made it besides her daughter as resource?

Continuity

 * Future Candace busts Phineas and Ferb when they build their first "Big Idea", the Coolest Coaster Ever, on the first day of summer. She also finds out how it disappears.
 * This is the first episode that the future has few plots of the first episode, Rollercoaster.
 * It's About Time!: The time machine from this episode reappears in this episode, along with the appearance of Professor Onassis, who created the original time machine.
 * It is said by Candace in the episode The Best Lazy Day Ever that she will date Jeremy through high school and college and then marry him and have two kids, Xavier and Amanda, which is seen in this episode, along with Xavier's brother, Fred.
 * Future Linda mentions that she's preparing for her Comeback-Comeback-Comeback-Comeback-Comeback-Comeback-Comeback Tour, presumably refering to her Lindana career first seen in Flop Starz. She says that if she does two more comeback tours, she gets a piece of pie.

Guest Stars
Bowling for Soupsing the second verse of Today is Gonna Be a Great Day in the future.

Cast

 * Vincent Martella as Phineas
 * Ashley Tisdale as Candace (Present & Future)
 * Thomas Sangster as Ferb
 * Alyson Stoner as Isabella
 * Maulik Pancholy as Baljeet
 * Caroline Rhea as Mom (Present & Future)
 * Kelly Hu as Stacy
 * Dan Povenmire as Dr. Doofenshmirtz (Present & Future)
 * Jeff "Swampy" Marsh as Major Monogram (Present & Future)
 * Richard O'Brien as Dad
 * Dee Bradley Baker as Perry (Present & Future)
 * Tyler Mann as Karl (Future)
 * Jennifer Stone as Amanda
 * as Xavier
 * Moises Arias as Fred
 * Jennifer Grey as Librarian
 * Sandra Oh as one of Doofenshmirtz's backup dancers
 * Bowling For Soup as themselves