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Only minutes to go before my ingenius device is complete. And then I, Professor Triple X Large, will do something that change the world for kids everywhere. Bwahahaha!
~ Professor XXXL

Professor XXXL (pronounced "Triple Extra Large") is a supporting antagonist in Codename: Kids Next Door. He is an insane, round-shaped scientist whose main goal is to create the perfect snowcone and is known for frequently mutating himself, having different animal parts in each of his appearances (such as a lobster claw, turtle shell and octopus tentacles). He is also bent on destroying the PTA (Parent-Teacher Organization) for some strange reason.

He was voiced by Frank Welker.


While the Professor's actual goals are harmless, if not "good" by the show's standards (centered on the interests of children), his bizarre methods of reaching them, insanity and overall sinister demeanor make him much more dangerous than helpful and create the illusion that he is actually evil and out to harm children like the show's other villains, which is what causes him to be at odds with the KND. In both episodes where he is the main antagonist ("Operation: A.R.C.T.I.C." and "Operation: C.O.L.L.E.G.E."), the only reason the kids are fighting him is because they mistakenly believe he is behind some evil plot and attack him, causing the Professor to retaliate and ruining his snowcone experiments in the process, angering him further.



  • Professor XXXL is in fact a leftover character from Mr. Warburton's previous failed pilot Kenny and the Chimp, from which the Kids Next Door originated as an idea and the pilot of which features the Professor, is included in the first episode of the show's run alongside the KND pilot. This may be the reason for the character's rather out-of-place role in the show.
    • Interestingly, the five main protagonists of Codename: Kids Next Door were initially planned to be antagonists in Kenny and the Chimp where Professor XXXL debuted in before the pilot was scrapped.


           KNDLogo.png Villains

Father | Mr. Boss | Toiletnator | Mr. Wink and Mr. Fibb | Count Spankulot | Ice Cream Men | Gramma Stuffum | Stickybeard | Knightbrace | Common Cold | Mr. Fizz | Crazy Old Cat Lady | Professor XXXL | Chester | Mega Mom and Destructo Dad | Parent Teacher Organization of Eradicating Youngsters | Proper Patrol | Mrs. Goodwall | Mr. Mogul | Great Puttinski | Nurse Claiborne | Mrs. Thompson | Cheese Shogun Roquefort | Robin Food | Truck Driver | Dodgeball Wizard | Black John Licorice | Grandfather

Teen Ninjas
The Steve | Cree Lincoln | Chad Dickson | Justin Cavallero | Numbuh 12

The Delightful Children From Down The Lane | Madame Margaret | King Sandy | Six-Gum Gang | Interesting Twins From Beneath the Mountain | James Nixon McGarfield | Anna Worthington | Valerie | The Big Badolescent | Henrietta Von Marzipan | Mushi Sanban | Windsor | Crayon Boy | Numbuh Infinity | Numbuh 48 Flavors | Galactic Kids Next Door

Ice Cream Monster | Mutant Lice | Delightful Reaper

Senior Citi-zombies | Sinister Felines From Atop the Litterbox | Mandy | Grim