Portrayer Peter Crugo
First appearance "Brain Drain"
Taxon {{{taxon}}}
Gender Male
Age Unknown
Occupation Evil Wizard, Nerditorium Shop Owner
Family Unknown
Friends Zarnot
Enemies Yin Yang
Residence Nacho Bar
Content classification
Species Dead skull, formerly human

An evil wizard who lost his body few thousand years ago. He first appeared in "Brain Drain"



Mastermind is power hungry, and wishes to gain full domination of the planet as he did in the past. He has a british accent and prefers to dance (he dances like a sick moose). He also has a short temper, which results that his head is engulfed in green flames which are usually extinguished by emergency water sprinklers.


At first, Mastermind used to be a humanoid wizard with a pointy beard who used have an imperium that spanded 12 continents on a planet that had 7. After that he took the form of a levitating purple skull surrounded by green flames, which seriously impaired his abilities. Last, he took posession of Yang's body, by swapping brains with Yang.

His mittens also seem to be sentient, but also serve as hands once required.


In his human form, Mastermind was able to cast lighting from his mittens. His skull form probably has less abilities, since Mastermind uses enchanted coupons to perform his possession ability. Through this, Mastermind is able to swap brains with the other who willingly signs the coupon. When Yang signed the coupon, he got a large sombrero in exchange for his body. After the possession, Mastermind is able to use all of Yang's abilities, with the exception of experiencing pain(due to all the feeling of pain being transfered to Yang while he was just a brain).

YinYangMaster Yo
LinaRoger Skelewog Jr.DaveCoopThe BoogeymanJobeauxMelodiaVincent Von GrowlRainbowManeChai and Ti
The Night MasterCarl the Evil Cockroach WizardEradicusEradicus' MinionsBrother HermanUltimooseYuckSmokeMirrorsSaranoiaZarnotPondscümFastidious J. SpiffingtonChung Pow KittiesKragglerThe PuffinMastermindBadfootThe Manotaur
Minor Villains
FlaviourGrizzleflavinDank and DireG.P.CharlesThe AntsThe BlixensBoopy Von Ha-Ha PantsRanger RonThe SmorksThe GreedCo CEOShillshoreFerocitusMiss MillipedeDance Monkey
Neutral Characters
EdnaRoger the SkelewogThe LessonHershel
Other Characters
MuffinF.L. SmeffmanMrs. SkelewogCoop's MotherLina's FatherDave's FatherDave's MotherNancy O. DelffaTillman
Fuzzy ThunderChipAnnieSamanthuhJeremyBirdCorkyMarkClamuelThe Lie FairyCHADThe Mighty Justice Orb
Terry OtterJason EarlesMitchel MussoShuki