The Grim Adventures of Billy and Mandy The exploits of the Grim Reaper, who has been forced into being the best friend of two children. A spin-off of the show Grim & Evil. Details Casts Season Lists Title The Grim Adventures of Billy and Mandy Genres Animation Comedy Kids First Air Date 2001-08-24 Last Air Date 2007-11-09 Episode Runtime 00 Hours 11 Minutes Total Season(s) 7 Total Episode(s) on All Seasons 184 Runtime 11 Production Companies Cartoon Network Studios Greg Eagles Grim (voice) Richard Steven Horvitz Billy (voice) Grey DeLisle Mandy (voice) Vanessa Marshall Irwin (voice) Season 1 23 Episodes 2001-08-24 Season 2 26 Episodes 2003-06-13 Season 3 32 Episodes 2004-06-11 Season 4 24 Episodes 2005-02-25 Season 5 11 Episodes 2005-07-29 Season 6 24 Episodes 2006-01-06 Season 7 21 Episodes 2006-06-06