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ProfNibbles

Professor Nibbles is a one-shot villain in Disney's Phineas and Ferb. He serves as the villain of a fictional show named "Katt Karr" (created by Phineas Flynn and Ferb Fletcher). He wears a mouse costume and only appears in the episode "Ferb TV".

He was voiced by Keith Ferguson.

Role

According to the episode, his nemesis (played by Danville Mayor Roger Doofenshmirtz, the younger brother of Dr. Heinz Doofenshmirtz) and a sentient car resembling a cat called Katt Karr are hunting down Professor Nibbles for some unknown crime he committed.

During the chase as both Roger and Katt Karr catch up to him driving in his motorcycle, Nibbles takes out a ball of yarn and cackles evilly as he throws it out, knowing that cats can't resist playing a ball of yarn. This distracted Katt Karr to chase after the ball of yarn to let Nibbles speed off more, much to Roger's anger and frustration.

However, in the end, Roger and Katt Karr inexplicably manage to stop Nibbles, who ends up being restrained by Roger while Katt Karr coughs up a huge hairball from unknown causes, much to both Roger and Nibbles' horror. It is implied that Nibbles is sent away to prison for his crime.

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           Phineas and Ferb Villains

Doofenshmirtz Evil Inc.
Heinz Doofenshmirtz | Norm | Vanessa Doofenshmirtz | Gelatin Monster | Balloony | Evil Platypus Clones (Jerry the Platypus) | Doofenshmirtz's Mecha | Alien-inator | Rodrigo | Mindless Repulsive Pharmacists

L.O.V.E.M.U.F.F.I.N.
Aloyse von Roddenstein | Dr. Bloodpudding | Dr. Diminutive | Charlie Bainbridge | Orville Von Roddenstein | TV Scientist | David Bringdown | Bannister Evil Enterprises (Professor Bannister, Bannister's Thugs, Me-Positive & Me-Negative) | Chloe | Dr. Killbot | Warehouse Goons

Doofenshmirtz Evil Inc.-2
Doofenshmirtz Family-2 (Heinz Doofenshmirtz-2, Charlene Doofenshmirtz-2 & Vanessa Doofenshmirtz-2) | Norm Bots | Goozim | Animal-Borgs (Perry the Platyborg, Peter the Pandaborg, Pinky the Chihuahuaborg & Terry the Turtleborg) | Giant Mechanical Ants | Tony Marzulo

Crossovers
Red Skull | MODOK | Whiplash | Venom | Darthenshmirtz | Stormtrooper Candace | Darth Ferb | Candace's C.O. | Norm-3PO | Stormtrooper Baljeet | Stormtrooper Buford | Pistachions (Derek, Dennis, Giant Pistachion & King Pistachion)

Time Shift
Jekyll Doofenshmirtz | Doofengung | Mongol Army (Doofus Khan) | Doofenshmirtz (1914) | Corn Colossus of Juatchadoon | Norm (1914) | Doofenshmirtz Evil Amalgamated (Professor Von Doofenshmirtz & Pneumatic Pnorman)

Fictional Characters
Torbo | Control Freak | Smile Away Reformatory School (Drill Sergeant) | Morty Williams | Giant Buford | Shape Shifter | Ninja Vampires | Doofenwarlock | Spider-Monkey | Doofenwarlock Guards | Flying Squirrels | Little Witch Suzy | Jared | Malifishmertz Evil Tradesman Association (Malifishmertz, Meatlings, Lawn Gnorme & Shepherd Spy) | Keeper of the Bridge of Comprehension | Candace's Id | Worthington Dubois | Inner Doofenshmirtz | Professor Nibbles | Der Kinderlumper

Other
Mr. and Mrs. Doofenshmirtz | Brobots | Suzy Johnson | Lloyd Wexler | Professor Destructicon | Dr. Gevaarlijk | Mitch | Esmeralda Poofenplotz | Dennis the Rabbit | The Regurgitator | Khaka Peü Peü | Busting Candace | Tower | Potato Gremlins | Zachariah Yore | Evil Carl (Evil Flynn-Fletcher Robots) | Liam McCracken | Morg | Peggy McGee | Random Swimwear (Mittington Random & Klimpalooners) | Professor Mystery | Professor Parenthesis (Mecha-Fleas)