|Oh Yeah! Cartoons|
|"The Really Bad Day!"|
|Season 3, Episode 40B|
|Airdate:||December 8, 2000|
|Written by:||Butch Hartman|
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|"The Fish and Fishman"||"Super Humor"|
For one day in a certain number of years, a fairy godparent has to be "bad", and it is Cosmo's turn. There is just one problem: he is horrible at being "bad." Timmy Turner and Wanda try to help him. So they enlist in the help of the conqueror Genghis Khan to teach him how to be bad, and soon Cosmo has a plan to blow up the Earth!
Home video releases
- The Fairly OddParents: Fairy Idol
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