"Undercover Carl" is the 42nd episode of Phineas and Ferb.
Phineas and Ferb create a device to reverse the effects of gravity. Meanwhile, Agent P is literally sent on a wild goose chase when Monogram believes the boys are actually out to destroy the Tri-State Area. Elsewhere, Doofenshmirtz finds the blueprints to the anti-gravity machine and takes them for his own purpose.
The episode starts when an apple falls on top of Phineas and Ferb's heads; Phineas talks about gravity and wonder if they can turn it around. Candace comes asking what they are doing and Phineas says they wonder if they can defy gravity. Candace tells it's impossible since it's a Universal Law, just like not wearing white after Labor Day. Phineas states that it's despotism for an Absolute Law with no hope of appeal, and suddenly knows what to do today and wonders where Perry is. Candace points out that he was beside them, and Phineas says he didn't see him. At the O.W.C.A., Carl was updating his status report on his website when Major Monogram conducts his evaluation form and shows Carl that he has gold stars at Studious and Hygiene but not at Initiative. He needs to show more. Carl pleads to Monogram to make it and is given 24 hours to show Initiative before Monogram has to submit his evaluation. To do this, Carl decides to check any suspicious activity on the internet.
At Phineas and Ferb's house, they send their blueprint for an Anti-Gravity Fun Launcher to their website so that Baljeet can check it. He calls them to say that it is 97% complete, but makes a minor adjustment to make it perfect and tries to joke about it. At Doofenshmirtz Evil Incorporated, Doofenshmirtz was bored and has no idea what to do. Norm asks him about the jigsaw puzzle, but Doofenshmirtz stated that without the cover box he can't finish it. Norm then asks him about finishing his Popsicle-stick bride, but Doofenshmirtz says that until the blue dye is out of his system he can't finish it, either. Norm then kisses his Popsicle-stick bride, to which Doofenshmirtz describes Norm a "sick, sick robot". Since Doofenshmirtz needs an evil scheme but is not in a mood to create one, he decides to steal an idea from a blueprint off the internet. He then stumbles on Phineas and Ferb's Anti-Gravity Fun Launcher, downloads it and renames it as Anti-Gravity Evil Launchinator. He's not sure what to do with it and waits until something come to his mind.
At the O.W.C.A, Carl gets a transmission that Doofenshmirtz downloaded something off the internet. Carl runs the words Anti-Gravity Fun Launcher into the Anagram Decoder and calls Major Monogram about it and says "Evil Fanatic Hunt R Raygun". When they check the source it shows it's from Phineas and Ferb, and Carl thinks that they work for Doofenshmirtz. Major Monogram thinks it's impossible but when Carl plays Phineas' voice by playing it backward and adjusting the syllables, they think that the boys' plan is to help Doofenshmirtz to destroy the Tri-State Area. They decide to keep an eye on them, but first Major Monogram sends Agent P to find a missing agent, codename Agent G, and gives him some locations in Iceland, Monte Carlo, Burbank, California and on the Moon. As Agent P leaves, Carl ask who Agent G is. Monogram states that is Gary the Gander (or Goose) is all a wild goose chase to distract Agent P, since he's too close to Phineas and Ferb. Carl asks who will investigate them, but Monogram says since that every agent is on a mission, he decides to choose Carl. After trying on different costumes, Carl is dispatched to his mission.
In the backyard, Phineas and Ferb, along with Isabella and Baljeet, are already building the Anti-Gravity Fun Launcher, when Phineas wonders where Perry is. Meanwhile, Agent P is climbing some snowy mountain to search for Agent G. Carl arrives at the backyard, where Major Monogram tells him to observe and infiltrate them. Isabella asks who the guy at the fence is, then Phineas asks Carl who he is. Carl tries to think some other name, but accidentally says his own name. Phineas welcomes him and asks if he can help and Carl agrees. He started to question each of them while constructing the Anti-Gravity Fun Launcher. After finishing the Anti-Gravity Fun Launcher, they try to decide who goes first and Isabella insists that Carl should go first. Carl goes in and activates the Anti-Gravity Fun Launcher, then everyone joins in. Carl asks if this has to do anything evil, but Phineas states that this is all for fun. Carl, along with the kids, are having fun when Candace sees them flying in mid-air and decides to find her Mom immediately. Meanwhile, Monogram tries to contact Carl, but just hears him screaming. Thinking that the intern is being tortured, Monogram quickly declares an emergency.
Outside at Doofenshmirtz Evil Incorporated, Doofenshmirtz thanks Norm for helping him and is happy that the Anti-Gravity Evil Launchinator runs on solar power. Unfortunately, a police officer gives him a ticket for parking the Anti-Gravity Evil Launchinator in a no parking zone and then quickly tows away his device. He chases after it. At Monte Carlo, Agent P is playing blackjack with a guy, until he shows the picture of Gary the Gander. After the guy says he knows nothing, Agent P attacks and interrogates him. After having fun in the Anti-Gravity Fun Launcher, the kids meet Major Monogram acting as Carl's father. Monogram asks Carl what he's doing since he never came "home." Carl plays along as his son, telling his "dad" he was having fun with his new friends, and whispers to him that the situation is neutralized. Major Monogram quickly calls his men to abort the mission and leave the area. Monogram tells Carl that they should go home now, and says goodbye to the kids. After Monogram and Carl left, Phineas says he's a nice kid and tells everyone to race inside the house that the loser will clean up the Anti-Gravity Fun Launcher.
Meanwhile, Doofenshmirtz tries to catch his Anti-Gravity Evil Launchinator but trips over a can after seeing another Anti-Gravity Evil Launchinator; he decides to call Norm to come and pick it up. In California, Agent P was a special guest on a TV show and his face was pixelated to cover his identity. Agent P shows the picture of Agent G and the host tells the viewers if that they sees Agent G they should call in immediately. Agent P quickly picks up the call and runs off while the host tells him that he forgot his pixelation. Back at Doofenshmirtz, he watches as Norm picks up the Anti-Gravity Fun Launcher and states he didn't know Norm could do that. Norm shows him that he can transform into a vehicle as well, to which Doofenshmirtz responds that he should read his instruction manual and Norm says he should. As they leave, Candace, along with her Mom, arrives at their home, telling her about the Anti-Gravity Fun Launcher. Candace is surprised that it is gone, but Linda doesn't find it surprising. Doofenshmirtz congratulates Norm and tells him that he's gonna finish his Popsicle-stick bride. However, they are then stopped by the police officer who this time gives Doofenshmirtz a ticket for driving a robot with more than two axles without a license. The officer then tows Norm away, while Doofenshmirtz curses the Motor-vehicle Code.
Back at O.W.C.A, Monogram is so proud of Carl for his effort that he gives him a gold star in Initiative on his evaluation report. Perry suddenly arrives in a space suit and Major Monogram apologizes to him about the wild goose chase also, since they can't find Agent G because he was gone for too long. Agent P shows them Agent G, that he was on vacation. Monogram decides that Agent P deserves the vacation, but since evil never rests, that he will be back tomorrow. Monogram salutes him. After an awkward silence, Major Monogram comments that his arm is getting tired and Agent P is not saluting back.
- Vincent Martella as Phineas
- Ashley Tisdale as Candace
- Thomas Sangster as Ferb
- Alyson Stoner as Isabella
- Caroline Rhea as Mom
- Dan Povenmire as Dr. Doofenshmirtz
- Jeff "Swampy" Marsh as Major Monogram
- Dee Bradley Baker as Perry
- Tyler Mann as Carl
- John Viener as Norm
- Maulik Pancholy as Baljeet
- Carl, Incognito
- When You Levitate
- Doofenshmirtz's tongue starts off as blue then stays red.
- When the truck takes away the Launchinator it was still gray but when Doofensmirtz was running past the Flynn-Fletcher house, the -inator was red.
- When Carl gets thrown the frisbee, he throws the frisbee; yet, in the next scene, the frisbee is gone.
- It is impossible for Carl to disguise himself as a bunny because the bunny is so small but it could be possible it's a robot or a bunny named Carl.
- When Perry is wearing his spacesuit, his eyes are blue instead of brown.
- Carl's cap/head went through Phineas and Ferb when they are levitating.
- When Doofenshmirtz says that the invention is now his (because he changed the name), he shows the blueprint to the audience. He flips it, so the blueprint should've been upside down when he looked at it.
- Since the tree is not an apple tree, an apple should not have fallen out of it.
- Carl's communication watch appears and disappears throughout the episode.
- When Phineas is talking with Baljeet on the telephone, Ferb's button on his clothes disappeared.
- During the montage where Carl is trying on different costumes before going undercover, he dresses as several characters that have been seen in previous episodes:
- Lawrence Fletcher
- Isabella Garcia-Shapiro
- Dr. Coconut
- Candace with a bag over her face from when she was suffering the allergy attack from "Jerk De Soleil"
- Dr. Doofenshmirtz
- Candace Flynn in her cavewoman costume from "Boyfriend From 27,000 B.C."
- Perry the Platypus
- The to-scale pink bunny costume may had came from Boyfriend From 27,000 B.C. when Carl and Monogram tell Perry to do his mission dressed as a big, pink bunny.
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