Okay, this villain is partly Brian's fault. But Aaron started it…

Aaron Richter had always been a bit, well, evil. Playing second fiddle on a stupid TV show was not enough for him-he wanted first chair. So under the cover of an infantile practical joke war, he tried to blow Brian up with a sofa bomb.

Unfortunately, Brian survived the blast. Thinking (for some reason) that it was just a practical joke, he retaliated by replacing Aaron's shower water with acid. Which, after he thought about it, was not a smart thing to do. But by then it was too late.

Aaron's face was horribly scarred by the acid, causing him to look like he was wearing clown makeup. All things considered, he got off pretty easy. But he didn't see it that way, and he decided to get back at Brian by killing him and taking over the show, using his new villain name of Aaron Nicholson. Why did he chose to change his last name? Who knows. This guy's bonkers.

Using a big plastic mask of his original face, he returned to the show from a six-month leave of absence. Despite the fact that the phrase "I'm gonna kill you, you idiot," seems to have worked its way into his conversations more often now, Brian hasn't noticed a thing. One would think the fact that he has an elastic string holding his face on would tip somebody off…