While the boys create a Perry-Tronic to make up for Perry's absence, Candace relies on a technique called B.B. (Busy Bee) Busting, where she tries to stop the boys from finishing their project so it doesn't disappear when Mom comes home, but it won't be easy for her in the least bit possible. Meanwhile, Doofenshmirtz creates a Duplicate-Inator 2 to clone his head and make himself twice as smart.

!! Tropes:
* BaitAndSwitch: After Phineas wonders where You-Know-Who is, the flute and bongos play... but then the camera cuts to Perry's usual spots for a lair entrance: the garden hose, the boys' bedroom, and the garage and he's not there. It is later revealed that this is because he was assigned by Monogram to fly around D.E.I. with a wing suit until Doof is ready for his scheme.
* BaitAndSwitchComment:
-->'''Candace:''' Look out the window.\\
'''Linda:''' Oh, my goodness...\\
'''Candace:''' Heeheehee...yeah? Yeah?\\
'''Linda:''' ...We really need to paint that fence!\\
'''Candace:''' ...What? That's all you have to say?
* CatchphraseInterruptus: The original Doof clone head does not disappear before he hits the ground, so he starts to say, "Curse—", but then disappears.
-->'''Doofenshmirtz''': What? Now we'll never know what he was going to say. ''(the inator explodes)'' Oh, yeah. Yeah. That.
* ADayInTheLimelight: The a-plot is mostly revolved around Candace.
* FailedASpotCheck:
** Lampshaded by Candace when Linda looks out the window and only looks at a fence needing to be painted, and failing to notice the Perrytronic right next to her. Though this was because she was in a duplicate of her own home created by the inator.
-->'''Candace:''' How could she not notice that?!
** When arriving home the first time, Linda fails to notice that they were ''two'' versions of her own house.
* GratuitousGerman: Doof's clone head calls him a ''"dummkopf"'' when Perry's cloned arm gets its own volition. When the arm attacks the head, the original Doof says, "Oh, who's the ''dummkopf now, dummkopf?''"
* HeadsIWinTailsYouLose:
-->'''Doof Head 1''': [[LamePunReaction Really? That's the best you've got?]]\\
'''Doof Head 5''': It's kinda obvious.\\
'''Doof Head 6''': Juvenile.\\
'''Doof Head 3''': I liked it!\\
'''Other Doof Heads''': You would!
* MesACrowd: Or rather, "my head is a crowd", because Doof duplicates his head several times.
* OffscreenTeleportation: Every time Candace goes to the room Linda previously went to, she's seemingly suddenly in another room. Candace lampshades it. She was actually in a duplicate of their own house created by the inator.
* PhantomLimbPain: One of the Doof head clones asks, "Do you guys get phantom pains? I got a heck of one in my elbow right now."
* RapidFireBut: Lampshaded by Candace twice. After the house duplicate disappears, she starts doing this, but then realizes, "I don't ''have'' to 'but-but-but'! I have the Perrytronic 3000!" Later, when the Perrytronic disappears, she goes, as the episode's punchline, "Okay, ''now'' I have to 'but-but-but'."
* ScrewThisImOuttaHere: After Candace explains her "Busy-Bee Busting (or BB-Busting)" strategy, Stacy thinks that Candace has finally snapped and just leaves.
* ShoutOut: The song parodies the theme to ''Anime/{{Gigantor}}''.
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