Billy & Mandy's Jacked-Up Halloween (The Grim Adventures of Billy & Mandy)

"Billy & Mandy's Jacked-Up Halloween" is the eighteenth episode in the first season of The Grim Adventures of Billy & Mandy.

Plot
Billy, Mandy, and Grim go trick-or-treating for Halloween, and Irwin is left behind because he needs a scarier costume. After pulling a trick on an old lady, and getting some candies, Grim tells the story of why people pull pranks, which he was partially responsible for. He tells about Jack (voiced by Wayne Knight), a prankster of the old Endsville who just never knew when to stop. One day, the citizens decided to punish him for his constant pranks, and they pulled a prank on the queen.

Why It Rocks

 * 1) Watching a montage of Billy, Mandy and Grim trick-or-treating at the start was very nice to watch, and the prank Mandy does to the old lady was clever and well deserved due to her saying that she's out of candy when she had a full stash all along.
 * 2) The story Grim tells about how Halloween became a special holiday was very interesting and makes sense, despite being slightly dark.
 * 3) * The story of Jack the Prankster was also interesting to watch.
 * 4) Some funny moments, such as the aforementioned prank Mandy does the old lady where she glues her doormat and covers her in water, along with Billy constantly saying trick or treat to Jack-o'-Lantern and even Jack the Prankster in the backstory (depending on your view). Plus, so much more!
 * 5) The pumpkins and trees the Spirits of the Underworld bring to life look very cool (especially the giant ones), along with Jack-o'-Lantern (his pumpkin form) and the Spirits, themselves.
 * 6) "The Sun will never rise again, and it will be Halloween every night forever! - Jack-o'-Lantern.
 * 7) Mandy having another costume inside a costume is very impressive. Speaking of which, the costumes look decent enough.
 * 8) Although the pumpkins and Jack-o'-Lantern laughing at Irwin along with him getting tortured was mean-spirited, at least the laughing made the pumpkins disappear and turn back into the Spirits of the Underworld.
 * 9) Decent Ending: As mentioned above, Jack-o'-Lantern laughing turned the pumpkins into spirits and then, Grim tickles him with a red feather, causing him to go into the green portal and Grim said he's in a better place. As for Jack, while he still pranked the people in hell, he got his comeuppance by getting attacked by the monsters.

Bad Qualities

 * 1) Although the backstory Grim told made sense, it's also slightly dark as it had Grim chopping off Jack's head. Thankfully, it was off-screen.
 * 2) * Depending on your view, Jack came off as an annoying prankster who took his pranks too far and was very annoying to lots of people, especially Grim. He never apologized at all nor did he feel remorse.
 * 3) Some toilet/gross-out humor here, such as Jack spitting on Grim and Billy mooning at Jack to try and stop him.
 * 4) It was pretty mean-spirited to Irwin, as Mandy didn't want him to go trick-or-treating with herself, Billy and Grim just because his costumes weren't scary enough, and then he got tortured with lots of traps meant for Jack near the end. To start things off, he got laughed at by Jack and his pumpkins (despite that being useful as mentioned above), got a bucket of water on his head and his boot, tripped on a banana peel, he fell from a hill, got bees and a nest in his mouth which stung him, his mouth got burned when he found out that the milk was hot sauce, electrocuted by eels, twice and got pied in the face.
 * 5) * The laughing also dragged out, as well.

Reception

 * This episode holds a rating of 8.7 out of 100 on IMDB.