This is list of Doofenshmirtz's schemes and inventions in Season 3.
| Episode | Invention(s) | Scheme | Failure/Destruction |
| "The Great Indoors" | Rain-inator
 |
He uses it to make it rain on the Tri-State Area so that he could watch El Matador De Amor without soccer game interruptions. | Perry uses his rope gun ties it on the bottom of the Rain-inator and it gets carried away by a plane. |
| "Canderemy" | Combine-inator
 |
He plans to combine an island and Capital of the Tri-State Area so legally he would be the ruler of the Tri-State Area. | When Rover dropped the Molecular Separator, it separated what Perry and Doofenshmirtz were attached to. Doofenshmirtz was squashed by Norm and Norm got crushed by the fridge. |
| "Run, Candace, Run" |  |
Dr. Doofenshmirtz's building is put up for sale so he tries to convince a prospective buyer, Annabelle, who turns out to be a long lost relative of the Johnson family, that it is not worth buying. | Doofenshmirtz gives in and calls Charlene . |
| "Last Train to Bustville" | Dodo-Bird-Incubator-inator
 |
Dr. Doofenshmirtz makes an egg turn into a dodo bird egg and is convinced that it is a fierce bird-monster that can help him take over the Tri-state area, but discovers the exact opposite when the egg hatches. | He doesn't think the dodo is frightening enough. |
| "Phineas' Birthday Clip-O-Rama!" |
Video-Beam-Hijack-Non-inator  Blow-Itself-Up-Inator  Inside-Out-Inator  |
Dr. Doofenshmirtz from using his "non-inator" to pre-empt his brother's biography from appearing on television. The latter two are from fake clips from the show. |
Perry uses a laser remote that shot the front legs of Video-Beam-Hijack-Non-Inator. The Blow-Itself-Up-Inator has predictable results. |
| "The Belly of the Beast" | Salt Water Taffy-inator
|
Dr. Doofenshmirtz invents the Salt Water Taffy-inator to give cavities to every kid in the Tri State Area. | Perry breaks the controls which made a lot of saltwater taffy squirt out. |
| "Moon Farm" | Moisture Suck-inator
 |
Dr. Doofenshmirtz attempts to use his Moisture Suck-inator to turn his neighbor's plants brown and to lose all moisture, so that his plants will be greener by comparison. | After shooting Perry and himself, Doof figures out the plants and man are plastic. |
| "Ask a Foolish Question" | Metal Unearth-inator
 All Purpose-inator  |
Dr. Doofenshmirtz loses the key to his latest invention, the All-Purpose-inator, so he makes the Metal-Unearth-inator to get it back. The All-Purpose-inator can do everything his previous inators did (except the Music-Video-Clip-inator, from "Phineas and Ferb Musical Cliptastic Countdown"). |
The Metal-Unearth-inator accidentally picks up Phineas and Ferb's super computer, the mole that got his key and it came with it. But the force of it all blew up the Metal Unearth-Inator, so the All Purpose-Inator would never be activated. |
| "Misperceived Monotreme" | Least Likely-inator  |
Dr. Doofenshmirtz's plan to zap his brother with his "Least Likely-inator", which will make Roger do the least likely thing he would do, which is making a fool of himself in front of the legislation. | The inator blows up. |
| "Candace Disconnected" | Pick 'Em Up-inator and Sarcastic Norm Head  |
Dr. Doofenshmirtz invents a Pick 'Em Up-inator to pick Vanessa up from class so that he can watch his exercise show. Later, he decides to create more to pick up everyone in the Tri-State Area so he can force them to do whatever he wants. He also has to deal with a Sarcastic Norm Head, the Norm head prototype that has an affinity for sarcasm. | The old Norm Head gets annoyed and takes itself to Easter Island and leaves the Pick 'Em Up-Inator there. |
| "Magic Carpet Ride" | Stain-inator
 |
Dr. Doofenshmirtz plans on ruining his brother's art unveiling by using his Stain-inator to ruin a mysterious painting, but as it turns out, the painting is Dr. Doofenshmirtz's very own masterpiece that he created when he was a youth back in Gimmelshtump. | He figures out his brother Roger was showing his painting, but before he could stop it the Stain-inator fired and the paintball ruined the painting. |
| "Bad Hair Day" | Very Very Bad-inator
 |
Dr. Doofenshmirtz has created the Very Very Bad-inator out of the most evil parts of his old inventions, and he attempts to see what it does. | Phineas and Ferb's Hair Remover trips him and his jet skiff flies with the Very Very Bad-Inator. |
| "Meatloaf Surprise" | Rotten-inator  |
Dr. Doofenshmirtz has plans to enter his family meatloaf recipe into the competition using "hate" as the special ingredient (as opposed to love). And just in case, he got the Rotten-inator to rot up his other opponents' meatloaves. | Doofenshmirtz accidentally hits his meatloaf and Perry destroys it by using a blender. |
| "Phineas and Ferb Interrupted" | Dull and Boring-inator (Later turned into a Dynamic-inator) |
Dr. Doofenshmirtz builds a Dull and Boring-Inator, to make himself more interesting by comparison to everyone else. Perry soon helps Doofenshmirtz rebuilt it into a Dynamic-Inator to reverse the effects of the Dull and Boring-Inator on Phineas and Ferb, Doofenshmirtz under the impression that he'll zap himself to be more interesting than everyone else. | Doofenshmirtz pushes Perry when he points it on the suburbs making Linda dynamic instead of Phineas and Ferb. |
| "A Real Boy" | Forget-About-It-inator
 |
When Dr. Doofenshmirtz thinks Vanessa overhears him say he would rather have a son to do his evil bidding, he feels terrible so he zaps her with the Forget-About-It-Inator. It can make the victim forget what they're currently thinking. Its effects eventually were reversed.
When Rodney taunts Doofenshmirtz daughters are useless and sons are great help he shows him his Super Zap Izer. |
Doofenshmirtz accidentally blasts himself so he forgot how the Forget-About-it-Inator worked once he was zapped with it so he kept pressing the fire button then it exploded, |
| "Mommy Can You Hear Me?" | Chicken Soup-inator  
|
Doofenshmirtz went to Tony's Delicatessen to order a chicken soup but he argued with the owner over a fly (or raisin) that he found in the soup. He created the chicken soup-inator to destroy Tony's Delicatessen and create a new deli. | Perry kicks Doofenshmirtz to his Inator, it accidentally activates and explodes. |
| "Road Trip" | Big Rig
  |
Doofenshmirtz uses a big rig to transport his boom juice, which is what he needs for his inators' self-destruct feature, across the Tri-State Area. To battle with Perry while in the rig, Doofensmirtz used the Hitch-a-Ride-Inator to connect to the Fetchers' RV. | Perry cuts the Hitch-a-Ride-Inator and the Big Rig lands into Cactus Gorge then the Big Rig blows up in a giant explosion. And just when Doofenshmirtz thought things couldn't get any worse, he got covered in flaming cactus from the explosion. |
| Phineas and Ferb The Movie: Across the 2nd Dimension | Other-Dimension-inator and Other Other-Dimension-inator
 Normbots  
  |
Doofenshmirtz creates the Other-Dimension-ator to travel to another dimensions, he goes through it and finds himself in an alternate universe in which a more evil version of him rules his world with robots. It is unknown why he built it to begin with. He builds another version of it in the second dimension. He refers to it as the "Other Other-Dimension-inator".He also mentions trying to conquer Danville with an army of giant robots but failed because of the self-destruct button at the bottom of their feet. The Amnesianator is used to wipe out the memories of those who has seen Perry's identity and the events that happened today. It is considerably larger and more powerful than the Forget-About-It-inator. | Succeeds in activating the Other-Dimension-inator (thanks to the help from Phineas and Ferb). He later gets his memory erased by the Amnesia-Inator, another one of his inventions that he appearently used on himself. |
| "Tour de Ferb" | Pop-Up-inator
 |
Doofenshmirtz attempts to use his Pop-Up-inator to place his own evil pop up ads virtually everywhere in the Tri-State Area. | Perry pushes the Pop-Up-inator off the balcony. |
| "Skiddley Whiffers" | Being overprotective to his daughter.
|
Tries to protect his daughter on a camping trip. | Vanessa makes him stop, but when bees attack, he uses himself to stop them. |
| "My Fair Goalie" | If-a-Tree-Fell-in-the-Forest-inator
 |
Tries to force anything to fall and say his name. | Perry destroyed the Inator by reflecting its ray off a mirror. |
| "That's the Spirit" | Mind-Transfer-inator
 |
Doofenshmirtz plans to swap minds with a cow so he can destroy all the grass in the Tri-State Area. However, it instead turns him into a were-cow every full moon. | Chased by an angry mob. |
| "The Curse of Candace" | Gimmelshtump-inator
 |
Doofenshmirtz attempts to turn the Tri-State Area into a copy of Gimmelshtump so it will be easier to take over. | Perry pushes the Gimmelshtump-Inator out the balcony turning Gimmelshtump back into Danville. |
| "Escape from Phineas Tower" | Rude-inator | Dr. Doofenshmirtz invents a "Rude-Inator" to ruin Roger's meeting with a visiting dignitary from England. Instead it hits the boys' tower, turning its computer controls against them. | Perry puts a cork in the Inator's shooter and when Perry leaves, Doofenshmirtz hits the button so many times the Inator explodes. |
| "Lotsa Latkes" | Historical Army Retrieve-inator
|
Dr. Doofenshmirtz's plans on using his latest "-inator," a potato-powered "Historical Army Retrieve-Inator," to summon the Spartan army and command them to take over the Tri-State Area. | Perry puts the Inator in reverse and makes the huns and Doofenshmirtz go back to the past. |
| Norm and Propaganda
|
Dr. Doofenshmirtz decides to use propaganda as his new "inator," believing that it will work since people will believe anything they read. | Perry takes off Norm's fuel cap and Norm goes out of control and crash lands. (It is unknown how he survived the fall.) | |
| "A Phineas and Ferb Family Christmas" | Transport-inator
|
He could go on shopping while everybody else was circling around looking for parking spaces. Doofenshmirtz admitted it was more unfair than evil before switching on the Transport-Inator which immediately began transporting him to the shopping stores to begin shopping for Christmas. | Perry cracks it and it transports him to the Flynn-Fletcher household, then Doofenshmirtz takes the party to his place accidentally and it explodes. |
| "Tri-Stone Area" | Stick-inator
|
Doofengung wanted to poke the mammoths, in order to make them stampede on Ro-juh's home so he can live there himself, since his home was not as great as his. | When Doofengung poked the mammoths, instead of stampeding at Ro-juh's home, they angrily charged at Doofengung for poking them, destroying his stone house. |
| "Doof Dynasty" | Kidnapping Princess Isabella
|
Doofus Khan kidnaps Princess Isabella so Regent Monogram won't be able to get in his way while he builds a giant dragon to destroy the Tri-Provence Area. | Phineas and Ferb free Isabella, and use a giant terracotta warrior to fight the dragon while Master Perry takes the key of the dragon out of its mouth to shut it down. |
| "Excaliferb" | Unearthly Rain
|
Malifishmertz creates an army of canned meat monsters to take over the Tri-Kingdom Area. However, the meatlings turn out to be smaller, cuter, and less evil than he expected, so he creates an unearthly rain which will make the meatlings more evil.
Does everything that the boys potions can do. |
Phineas, Ferbalot, Parable, and the army of 10,000 monsters battle the meatlings, and by using a potion on himself, Ferb turns into Medusa and turns the meatlings to stone.
When Candavere shows up the septor explodes. Despite this, Malifishmertz escapes |
| "Phineas and Ferb and the Temple of Juatchadoon" | Controlling the Corn Colossus of Juatchadoon
|
Doofenshmirtz plans to steal the lost Amulet of Juatchadoon in order to control a giant Corn Colossus so he can take over the world. | Perry uses his fez to give the amulet to Ohio Flynn, who smashes it, causing the Colossus to burst into popcorn. |
| "Monster from the Id" | Underwear-inator
|
Doofenshmirtz’s evil plan is to use his Underwear-Inator to take over the Tri-State Area, since everyone's greatest fear is being caught in public in their underwear. | Perry removes some wires in the Underwear-Inator. |
| "Gi-Ants" | Turkey-inator
|
Doofenshmirtz feels tired and lethargic after eating turkey and decides to create a Turkey-Inator that will create a sleeping epidemic in Danville by turning things into giant irresistible turkeys. | Perry turns his Turkey-Inator into a giant turkey. |
| "The Remains of the Platypus" | Butler-inator
|
Doofenshmirtz makes Perry his butler with his Butler-inator, and Carl is trapped by Doofenshmirtz while in a squirrel costume. | Succeeds in turning Perry into his butler, but Perry wrote a message on his body saying "I fight evil" that can only be seen with a miror. When he sees it he's free from the effects of the Butler-Inator, and hits the Vaporizor-inator with a chair after. |
| "Mom's in the House" | Duplicate-inator 2
|
Doofenshmirtz thinks that two heads are better than one. | Perry hits the Duplicate-Inator with a golf club, breaking it. |
| "Perry The Actorpus" | Mustache-inator
|
Doofenshmirtz plans to prank people with mustaches in their face, because he finds them amusing. | Perry takes out a wrench and destroys the Mustache-Inator, but not after giving Doofenshmirtz a mustache. |
| "Let's Bounce" |
Tell-the-Truth-inator  
Robot Abraham Lincoln
|
Doofenshmirtz tries to get people to tell the truth so that society will fall apart. It also has an Abe Lincoln Robot as a decoration because of his nickname, "Honest Abe". | Honest Abe Lincoln smashes the controller, causing the Tell-the-truth-Inator go haywire. |
| "Bully Bromance Breakup" | Sculpt-inator
|
Doofenshmirtz plans to sculpt Danville Mountain with his face. | When Doofenshmirtz tried to sculpt his body on the mountain, Perry attacks Doofenshmirtz, and it scans his bad face. Afterwards, Perry scans a scale model of the mountain, turning it back to normal as Perry destroys it off-screen. |
| "Quietest Day Ever" | De-Handsome-inator
|
Doofenshmirtz originally wanted to use this inator to make handsome men ugly. However, it zapped Doofenshmirtz while set on "Not Ugly", making Doof irresistably handsome. Doof then uses this to his advantage to try and become mayor of the Tri-State Area. | Perry tried to use the De-Handsome-inator to zap Doofenshmirtz before he was crowned mayor, but there were too many balloons in the way. So, Perry sets up many mirrors to bounce the ray until it hit Doofenshmirtz, making him ugly again. |
| "The Doonkelberry Imperative" | Druelselsteinian Driving Test
|
Perry and Dr. Doofenshmirtz find themselves across the ocean as Doofenshmirtz returns home to renew his Druelselsteinian driver's license. | He succeeds in the driving test, but fails to get back home. |
| "Delivery of Destiny" | Juice-inator
|
Doofenshmirtz wants to turn City Hall into juice. | The mail delivery guy Paul wraps up the Juice-inator with tape and it turns itself into juice. |
| "Buford Confidential" | De-Twist-inator 
|
Since Doofenshmirtz could never twist a perfect pretzel, he invents the Detwistinator, a device that would straighten out any twist. He planned on zapping the Danville Pretzel Festival to get his revenge. | Perry used the sticky mint and blanket stuck to his head to send Doof spinning into the De-Twist-inator, destroying it. |
| "The Mom Attractor" | Baby-Cry-inator
|
Doofenshmirtz plans to make Roger undesirable as mayor by using the Baby-Cry-Inator to make people think babies hate him. | Phineas and Ferb's Mom attractor grabs the inator, stops its crying, and walks away with it. And since the crying stopped, everyone wanted Roger to be re-elected. |
| "Cranius Maximus" | Key-Find-inator
|
Doofenshmirtz wants to take all of the keys of the Tri-State Area so he can open any door he wants. But, he realizes that taking all of those keys was a hassle, so instead he decides to steal the Key to the City. | Perry returns all the keys, destroying the Key-Find-Inator. And although Doofenshmirtz succeeds in getting the Key to the City, he realizes that it can't fit into any key hole because it's too big and he gets struck by lightning. |
| "Minor Monogram" | Massive Propellers
|
Doofenshmirtz plants to lift the Tri-State Area with the idea of everybody wanting to be put on the ground so they will obey him. But Rodrigo stole the plan and wanted to break the Tri-State Area in two by manivulating the propellers at precise angles. | Monty Monogram arrived and defeated Rodrigo, and putting leaving the Tri-State Area normal. Doof then decides to continue his plan, but Perry kicks him and drops the Tri-State Area in its proper place. |
| "Agent Doof" | Babe-inator
|
Doofenshmirtz wanted to turn his brother into a baby but the inator wasn't plugged in. | Norm accidentally plugs it in twice, first turning Phineas and Ferb and later Mom, Isabella along with several Fireside Girls into babies much to Candace's dismay. |
| "What A Croc!" | Chicken Replace-inator
|
Doofenshmirtz plans to ruin Roger's award for Mayor of the Year award by replacing it with a chicken. | Perry opens the beak and placed a rubber chicken inside. |
| "Sleepwalk Surprise" |
Confetti-inator, Cupcake-inator, Hug-inator,
|
Doofenshmirtz builds nice-inators in his sleep. He combines them to make a single inator. | Perry pushed part off the building, Norm trips causing part to fall off, and Doofenshmirtz accidentally tells Norm to push the last part off. |
| "Sci-Fi Pie Fly" | Dough Blow-inator 
|
Doofenshmirtz challenges the pizza guy to a contest and uses the Dough-Blow-Inator to cheat. | Perry switches the setting from "blow" to "suck" in the Dough-blow-Inator and it sucks in everything causing it to explode. |
| "Sipping with the Enemy" | Cool-inator 
|
Powered by a gallon of cappuccino, Doofenshmirtz tries to suck the coolness out of everyone at a trendy coffee bar. | Deflected (and destroyed) by Perry, the device makes Linda and Lawrence cooler than usual instead of Doofenshmirtz. |
| "Tri-State Treasure: Boot of Secrets" | De-Age-inator 
|
Makes himself younger to enter film contest using his film to try and take over Tri-State Area. | Works well, but still loses the film festival to Phineas and Ferb. |
| "Doofapus" | Platyp-inator
Double-inator |
Doofenshmirtz uses the Platypu-inator to turn himself into a platypus to be evenly matched with Perry, but when it gets to be exhausting, Doof then plans to duplicate himself with the Double-inator to outmatch Perry. | Perry rams the Platypu-inator into the Double-inator, destroying them both. |
| "Norm Unleashed" | Norm's Weaponry Schmaltz-inator
|
Doofenshmirtz ends up in jury duty, so Norm takes over his schemes by weaponizing himself.
Dr. Diminutive mentions that Doofenshmirtz has made a Schmaltz-inator. |
Perry lures Norm's squirrel heart out of him causing Norm to lose power and crash to the ground.
Dr. Diminutive steals Doofenshmirtz's inator. Later, they both go to jail. |
| "Where's Perry?" | Fitness Equipment Lock-inator
|
The Fitness Equipment Lock-inator was made to lock up every fitness machine in the Tri-State Area. That way, everyone will become overweight and Doofenshmirtz can take over with ease. But, it turns out that this was not his true evil scheme. When Perry left, he broke out the Ultimate Evil-inator in order to turn Major Monogram evil and rule the Tri-State Area through the O.W.C.A. | In a rush, Doofenshmirtz destroys the Fitness Equipment Lock-inator by pressing the Self-Destruct button, and the Ultimate Evil-inator doesn't hit its intended target. Instead, the blast bounces off of Major Monogram's hand mirror and hits Carl. |
| "Where's Perry? (Part Two)" | Julienn-inator
|
Doofenshmirtz had no choice but to work together with Major Monogram in order to stop Carl from taking over the Tri-State Area. To do so, he made a Re-Good-inator to reverse the effects of the Ultimate Evil-inator. | The Go Home-inator sends Perry to Africa.
Although there were some complications with the Re-Good Inator, it does not fail to turn Carl back to normal. |
| "When Worlds Collide" | Double Dutch Machine
|
He knew that the true measure of a man is having a world famous roadside attraction, so he wanted to steal the World's Largest Ball of Twine so it could be his. | The World's Largest Ball of Twine ravels around the Whalemingo planet, and ravels around the tip of the Sphere-Attract-Inator. As the planet goes up, it takes the World's Largest Ball of Twine and the Sphere-Attract-Inator along with it. |
| "What'd I Miss?" | A-Leaky Faucet-inator
|
Doof plans to embarras his brother Roger at Everybody's a winner beauty pageant. Thought of it while losing sleep over a dripping faucet.
Makes everyone want peach cobbler. |
The drip went to the Flynn-Fletcher house instead.
Perry throws some sand at the Peach Cobbler-inator, shorting it out. |
| "Road to Danville" | Trip to the Desert-inator
|
Wanted to keep Perry out of his way by transporting him to the desert so he can do his play. | Accidentally transports Doof and Perry to the middle of a desert far away from Danville. |
| "This Is Your Backstory" | Back-story-inator
|
To use his backstories as a source to become more evil | After Perry revealed his photos, Doof blows up the Back-story-inator with overwhelming nice backstories of Perry |
| "Blackout!" | Big Sad Eye-inator
|
To give himself big sad eyes so that people would pity him give him whatever he wanted. | He tries to used it on Roger, but when the power came back it just freaks him out. |
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