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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 commited.

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 | David Bringdown | Bannister Evil Enterprises (Professor Bannister, Bannister's Thugs, Me-Positive & Me-Negative) | 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) | Tony Marzulo

Other Evil Scientists
Lloyd Wexler | Professor Destructicon | Dr. Gevaarlijk | Mitch | Esmeralda Poofenplotz | Zachariah Yore | Evil Carl (Evil Flynn-Fletcher Robots) | Random Swimwear (Mittington Random & Klimpalooners) | Professor Mystery | Professor Parenthesis (Mecha-Fleas)

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

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

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

Other
Brobots | Suzy Johnson | Dennis the Rabbit | The Regurgitator | Khaka Peü Peü | Busting Candace | Tower | Potato Gremlins | Liam McCracken | Morg | Peggy McGee