H²O

H²O is the fifth episode of Season 5, and the 117th overall.

Synopsis
Homer becomes the most smartest person in the world after watching a genius training video.

Plot
At the Nuclear Power Plant,Homer was about to leave for work, only to get confronted by Mr. Burns, he tells him that his brain is: stupid, faulty wiring, and out of content. He tells him he needs to get smarter.

At home. Homer finds a DVDs. Marge insist that he puts it in, a bunch of educational video plays. Homer then turns it off before he can watch the rest. In nighttime Homer then plays the video on and a bunch more educational video turn into scientific stuff, mathematics, and other brainful stuff then comes up more to the screen.

In the morning, Marge wakes up to see Homer now has a large brain.

Trivia

 * The title of the episode has a hard to type character
 * "Dr. Brain" is a parody of the famus drink Dr. Pepper
 * There was deleted scene before the final production. It shows Kirie in the bathroom on a scalier in her underwear. she look at her weight seeing that she weights 227 pounds. she becomes upset. but Homer comes in that she should've eaten healthy foods and exercised. She agrees, after a montage, she goes back to the scalier to see that she is 50 pounds each. This was removed because of filler.