8. The Grim Adventures of Billy and Mandy
Billy and Mandy starred in their own spin off show from Grim and Evil and followed them on their exploits with the Grim Reaper, who is forced to be their best friend forever after winning a game to save Billy's pet. Billy was dimwitted whereas Mandy was the more sinister and evil of the two. Due to his forced friendship with them- Grim often ends up fantasizing about killing them just to get rid of them.Billy and Mandy use Grim's powers to travel to the underworld where various creatures are depicted such as Dracula, the Wolfman and the Bogeyman, in a humorous way. What made this show great was its toilet humor with added satire and black comedy which- when looking back on it made it appeal to adults as well.