The Grim Adventures of Billy & Mandy

The Grim Adventures of Billy & Mandy (commonly referred to as Billy & Mandy) is a animated TV series created by Maxwell Atoms. The show first appeared on Cartoon Network in 2003 and it is a spin-off of the show Grim & Evil. The show was about two children named Billy and Mandy who got the Grim Reaper to be their best friend forever, by beating him in a game of limbo to compete for the life of Mr. Snuggles (Billy's hamster). The show ended on November 9, 2007 (however due to a unmade spin-off named Underfist which only had one episode made, causing it to be classed as an episode of The Grim Adventures of Billy & Mandy instead, because of this the show really ended on October 12, 2008). There were 71 episodes made before the show ended.

Little Rock of Horrors
One night, Billy was feeling lonely, so he asked Mandy to play with him. She was busy reading a book. He asked Grim, but Grim turned him down too. Billy then goes over to Irwin's house to see what he was doing. Irwin was watching a movie, and didn't see Billy in the window. Billy walks off, all mopey. He lookes at a twinkling star in the sky and made a wish for someone to play with him. The star came shooting out of the sky and into Billy's backyard! The star was just a meteor who sings! He asked Billy for some brains. So he gathered everyone in Endsville (except for Grim and Mandy). It accepted Irwin as its first victim. The Last Victim is Mandy. Mandy notices the meteor and walks over to it. The meteor eats her brain, but he melts due to her brain being "spicy". She becomes the meteor and asks Billy for brains.

Scythe for Sale (Season 5, Episode 2)
Billy sells Grim's Scythe to Irwin, who forces Mandy to be his girlfriend, and then his wife through a forced wedding.