The Troublesome Treachery of the Thieving Toot Fairy

The Troublesome Treachery of the Thieving Toot Fairy is the thirteenth episode of The Epic Tales of Captain Underpants and the final episode of season one.

Synopsis
It's a race against time as George and Harold try to get Mr. Krupp fired before he can have them expelled, and they have the help of the reluctant Melvin Sneedly, and another problem; they have to get past the security compound's walls and defeat the revenge-crazed Smartsy Fartsy (disguised as the Toot Fairy to collect the farts he needs to make an army for his revenge).

Summary
Melvin Sneedly is still talking to this mysterious dude in this creepy robe, but it is actually Vil Endenemys. He said he'll use his power to get Melvin accepted into his dream school. Krupp calls George Beard and Harold Hutchins to a store where they eat onion rings. Benjamin Krupp said that he knows that they're trying to get the rulebook, which will bring them to Krupp's office for Visit 500. Melvin had to help George and Harold to get the rulebook. So he creates the new Elevapor 2000. Which the Toot Fairy {actually Smartsy Fartsy from the last episode} used to create his fart army. They proceeded to Hanks.Hidee Holes, which is where Krupp hid the rulebook. Smartsy declared that from this day onwards, humans and farts can live in peace. Dr. Vil Endenemys fires Mr. Krupp and expels George and Harold. They reveal that Vil Endenemys is a future version of Melvin Sneedly, and the two Melvins laugh manically as the boys and Mr. Krupp look at them in shock.

Trivia

 * It is revealed that Vil Endenemys is actually Melvin from the future.
 * Melvin and his future self become the new principals and Krupp is fired.
 * George and Harold get expelled.
 * Moral: Revenge doesn't solve anything and makes you no better than your enemies.
 * This is the first episode featuring Melvinborg. This is his only Season One appearance.
 * Mr. Krupp suddenly loses his real hair when he worries about getting fired from being principal.
 * This is the second time where Erica Wang makes a non-speaking cameo. This first was The Costly Conundrum of the Calamitous Claylossus

Goofs

 * When Captain Underpants turns back into Mr. Krupp, he freaks out realizing he's naked, then he runs in his house, leaving his cape outside on the ground. But when Harold and George spy on him from the tree through his window, with him looking at the picture of him at school, he's suddenly wearing his cape again.
 * Vil Endenemys only has one L, where did the one for Melvin Sneedly come from?