Keeper of the Reaper (The Grim Adventures of Billy & Mandy)

"Keeper of the Reaper" is the second episode in the fifth season of The Grim Adventures of Billy & Mandy.

Plot
When Billy's dad gets a promotion in his job, he tells his family they are going to move to another town, starting a dispute between Billy and Mandy over who gets custody of Grim. Grim suggests they settle this in court, and hours later Billy, Mandy, and Grim find themselves in the Underworld court, presided by Judge Roy Spleen, and which has Fred Fredburger, an incorrigible dumb character, as a juror.

Why It Rocks

 * 1) First of all, it introduced a new and iconic character, Fred Fredburger, with his iconic quote, "Yes!" He is a very funny comic relief character and his catchphrase is also worth some chuckles, along with him slowly spelling his name.
 * 2) All the monsters' designs, along with Fred Fredburger's, look cool and decent.
 * 3) The monsters in court plot manages to avoid coming across as a Monsters, Inc and Aaahh! Real Monsters rip-off despite having similar premises.
 * 4) The backstory Billy tells Judge Roy Spleen is very interesting and is a pretty good reason why him and Mandy are settling in the courthouse.
 * 5) Some emotional moments, such as when Billy said goodbye to all the precious things in his old house when moving away and when all the monsters started crying when Fred said that Grim shouldn't be separated from Billy and Mandy and that friendship is very important.
 * 6) Some funny moments as well, such as when Billy mistakenly went to a tennis court after saying "I'll see you in court", him jabbing Jeff the Spider with a giant stick and basically most of Fred Fredburger's quotes as mentioned above, along with the fourth-wall breaks.
 * 7) Speaking of which, the fourth-wall breaks are well-timed, such as when Grim said in his cage "it's like I'm in some bad cartoon", and when the Judge said "I hear by sentence all of you to take a pee break, but come back or else". The second one is well-timed because of the ad breaks on television channels between shows.
 * 8) Some great cameos from past episodes, such as Jeffy the Spider from "Spider's Little Daddy", Lil' Porkchop from the episode with the same name and there's even Scooby-Doo! and Dr Ghastly from Evil Con Carne. Plus, a Yogi Bear parody during the "Keeper of the Reaper" song.
 * 9) The Keeper of the Reaper song the monsters, Billy and Mandy sing is very catchy and great to listen and dance to.
 * 10) Good Moral: Friendship is everyone's most personal treasure.

Bad Qualities

 * 1) Billy and Mandy were mostly unlikable here, as they keep fighting with each other throughout the episode and never gave Irwin a chance to tell the truth.
 * 2) Unfortunately, Fred Fredburger would go downhill after this in his next appearence, "Be A-Fred, Be Very A-Fred", where he became another generic comic relief. (Go to the link for more info).