Listen to The Grim Adventure of Billy and Mandy (From "The Grim Adventure of Billy and Mandy") online. The Grim Adventure of Billy and Mandy (From "The Grim Adventure of Billy and Mandy") is an English language song and is sung by Tricks and Treats. The Grim Adventure of Billy and Mandy (From "The Grim Adventure of Billy and Mandy"), from the album Kid's TV Themes (30 Children's TV Classics New & Old), was released in the year 2013. The duration of the song is 0:34. Download English songs online from JioSaavn.