After getting stuck in his dad's lucky pants, Billy calls on the Kids Next Door to help him but gets caught up on a mission with disastrously "delightful" results. Meanwhile, Mandy decides to try her hand at world domination by taking over the Kids Next Door.
Tropes:
- Ambition Is Evil: True to her character, Mandy instantly gets to work in taking over Kids Next Door after learning of their advanced technology and massive militia. And after realizing how powerful the Delightful Reaper is, she allows herself to be assimilated so she can take over their power!
- Answer Cut: Mandy is infuriated to find that the M.A.N.D.R.O.B.O.T.'s main weapons involve mustard cannons and demands to know what happened to the laser weapons she ordered. It then cuts to Numbuh 74.239 using those lasers to cut bratwurst with his science team.
- Arbitrary Skepticism: Nigel Uno, a Conspiracy Theorist that is the Arch-Enemy of a fire-wielding wizard, has a hard time believing that Grim is the actual Grim Reaper.
- Arson, Murder, and Jaywalking: The protagonists make their claim for what they're after in the Final Battle.Grim: I've come for me scythe!Numbuh 1: And I've come to rescue the Kids Next Door!Billy: And I've come for the "All-You-Can-Eat" Pancake Breakfast!
- The Assimilator: The Delightful Reaper assimilates anyone it slashes with Grim's scythe. The only one to still have something of a distinct personality is Billy (thanks to his stupidity) — until it assimilates Mandy, whereupon she becomes the dominant mind.
- Badass Normal: Armed with nothing but fury over the misuse of his pants, Harold manages to overpower the Delightful Reaper and gives the heroes a chance at winning.
- Bait-and-Switch: When Billy realizes the trouble he's in in the prologue, he claims that there's only one group of kids who can help him. The scene then cuts to Ed, Edd n Eddy showcasing their latest scam.
- Behemoth Battle: The climax features a three way battle between the Delightful Reaper, Mandy's M.A.N.D.R.O.B.O.T., and the Skeleton Samurai Kaiju piloted by Numbuh 1 and Grim.
- Big Bad Ensemble: There are two major villains in this episode: Mandy, who forcibly takes over the Kids Next Door by impersonating Numbuh 1, and the Delightful Reaper, an Eldritch Abomination that formed thanks to the combination of the Delightful Children, Billy, Harold's pants, and Grim's scythe all binding together in the newly-rebuilt delightfulization chamber.
- Big Damn Heroes: Just when Mandy combines with the Delightful Reaper, Harold arrives to retrieve his lucky pants, decked out in wrestling gear.
- A Birthday, Not a Break: Irwin's one scene is him hosting his birthday party only to be interrupted by the Delightful Reaper.
- Body Horror: The process through which the Delightful Children and Billy are merged into the Delightful Reaper is implied to be very painful, and involves their skulls being stripped to the bone.
- Breaking the Fourth Wall: Grim acknowledges he is a cartoon character at the end of the episode.Numbuh 1: Man, [Mandy]'s got problems.Grim: Try being in the same show with her everyday.
- Brick Joke: Billy is disappointed that Sector V aren't The Powerpuff Girls. Much later in the episode, the girls can be seen exploding from the Delightful Reaper.
- Calling Your Attacks: Grim and Numbuh 1 shout their attacks' names during the final battle against the Delightful Reaper. A stream of bones fired through their sword is called the Cone of Bones; while a slash is referred to as Skeleton Sword Strike.
- The Cameo:
- Ed, Edd n Eddy make a brief appearance in the beginning, name-dropping the Kids Next Door in the process. Eddy is later shown exploding from the Delightful Reaper once it's defeated.
- Several other Cartoon Network protagonists (including The Powerpuff Girls, who were also name-dropped and the aforementioned Eds) also appear in blink-and-you-miss-it shots, exploding from the Delightful Reaper after it's finally beaten.
- During the DR's rampage, Endsville children such as Irwin, Puddin, Sperg, Mindy and Pan(Dora) can be seen.
- The Tommy makes an appearance where he tries to stop Sperg from bullying Puddin.
- Chekhov's Gun: The Barnacle Bone that Grim tries to torture Numbuh 1 with becomes instrumental in fighting the Delightful Reaper in the climax, as it's used to merge the two heroes into a gigantic skeleton armor.
- Company Cross References: This being a crossover event, multiple references to Cartoon Network cartoons can be found throughout the episode.
- Billy initially calls Ed, Edd n Eddy to help with his pants problem.
- He later expresses disappointment that Sector V aren't The Powerpuff Girls.
- Fred Fredburger admits that he loves shows about monkeys, monkeys that go to camp, and shows about imaginary friends.
- The Creative Closing Credits feature artwork of crossovers between different Cartoon Network shows. This included Ed, Edd, n Mandy, Evil Camp Carne, Class of Numbuh 3000, My Gym Partner's A Mandark, and Samurai Mac.
- Continuity Nod: The Delightful Children bring back their Delightfulization Chamber which was used in previous seasons.
- Cool and Unusual Punishment: Mandy successfully tortures Numbuh 1 into breaking down after making him listen to Fred Fredburger ramble about his favorite cartoons.
- Crossover: Between Codename: Kids Next Door and The Grim Adventures of Billy & Mandy.
- Crossover Combo Villain: The Delightful Children From Down the Lane obtain the power of Grim’s scythe to become the Delightful Reaper.
- Dark Action Girl: Mandy becomes the leader of the Kids Next Door after impersonating Numbuh 1 and immediately hijacks the organization in an effort to take over the world.
- Eldritch Abomination: The Delightful Reaper is a gigantic monster formed by the combination of the Delightful Children's Hive Mind and Grim's supernatural powers. Its face is formed by the disembodied skulls of those whom it has assimilated.
- Evil Cannot Comprehend Good: Mandy is extremely annoyed and baffled at the fact that, in spite of all the KND's powerful weapons and massive numbers, the organization is dedicated to fighting for the rights of children rather than taking over the world. So she decides to do it herself.
- Face–Heel Turn: Outside of characters being assimilated into the Delightful Reaper, Numbuhs 3 and 4 are appointed by Mandy as her bodyguards after taking over the Kids Next Door.
- Fandom Rivalry: In-Universe. Two groups of fangirls are shown arguing over which is the superior toy: Rainbow Monkeys or Sassy Cat.
- Freeze-Frame Bonus: Several Cartoon Network characters are freed from the Delightful Reaper at the end, but you'd have to rewatch the scene in Slow Motion to catch them all. To spare you the trouble, here's a complete list of the cameos: Mac and Goo, Adam Lyon, The Powerpuff Girls, Dexter, Dee Dee, and Mandark, Andy Johnson, and Eddy.
- Fun with Acronyms:
- When Mandy takes over, she christens her new base as the MND or Mandy's New Dictatorship.
- Invoked. Because Mandy didn't give Numbuh 3 enough time, the latter had to give the M.A.N.D.R.O.B.O.T. the rushed acronym of Monkeys And Nice Doggies Relax On Bellies Of Turtles.Mandy: What kind of acronym is that?!Numbuh 3: Well, if you weren't in such a rush, maybe I could have come up with a better one.
- Fusion Dance:
- The Delightful Reaper is created via an accidental fusion between Billy, the Delightful Children Down the Lane, Grim's scythe and Harold's lucky pants. The creature goes on to assimilate Numbuhs 2, 3 and 4, several kids from other Cartoon Network shows and eventually Mandy herself.
- Using the Barnacle Bone, Grim and Numbuh 1 create a giant skeleton samurai armour, with Grim's head as the shield and Numbuh 1 as the pilot.
- Here We Go Again!: Subverted. At the end of the episode, Billy shows up poorly disguised as Numbuh 1 and proclaims that there are going to be some changes around the KND. Thankfully, everyone pelts him with random objects.
- It's All About Me: Mandy's takeover of the moonbase involves having everyone wear uniforms based on her image.
- Just Think of the Potential!: Mandy points out that with the technology at their disposal, the KND could easily take over the world. Instead, however, they use it to fight for kids' rights. She's vexed, and uses it to justify her takeover to Grim and Numbuh 1.
- Mistaken for Undead: Inverted. After meeting the Grim Reaper, Numbuh 5 mistakes him for a regular guy in desperate need of some skin lotion.
- Motif Merger: The opening sequence combines elements from both openings. Such as Billy, Mandy and Grim getting into position for the title, as well as Sector V having bone-to-flesh transformation sequences. It even mixes the names of the shows' respective creators, thus giving us "created by mr. atoms and maxwell warburton".
- Noodle Incident: According to Numbuh 1, the KND are aware of the supernatural activity that plagues Endsville and have tried to avoid going there as much as possible.
- Oh, Crap!: Numbuh 1 and Grim are horrified when they realize the moonbase has been taken over by Mandy.Numbuh 1: Oh no! Not her again!
- Only Sane Man: Numbuhs 1 and 5 are the only ones to act with any measure of rationality, opposing Mandy's takeover of KND and seeing through her Paper-Thin Disguise.
- Paper-Thin Disguise:
- Numbuh 1's Billy disguise consists of his clothes and a tomato for a nose. The only ones not fooled by it are Mandy and Sector V, and the latter only because they were in on it. It even fools Grim.
- Mandy's Numbuh 1 disguise is just the boy's usual clothes and sunglasses. It fools everyone except Numbuh 5, with some children even complimenting "him" for finally growing some hair.
- Billy's Numbuh 1 disguise has him wearing a watermelon rind as a mockery of Nigel's bald head, orange slices for ears, and pencils for eyebrows. No one is fooled by it.
- Potty Emergency: Billy runs to the Delightfulization Chamber mistaking it for a port-o-potty, which kickstarts the genesis of the Delightful Reaper.
- Scared of What's Behind You: In one scene, Sperg is seen bullying Pud'n, only to be confronted by Tommy, causing him to look at him in fear, until the camera zooms out to show that he was actually looking at the Delightful Reaper behind Tommy, who proceeds to assimilate all three of them.
- Screw This, I'm Outta Here: The ultra-dedicated Numbuh 1 barely lasts a couple of hours in Endsville disguised as Billy before he decides, KND or no, the mission isn't worth it and tries to ditch.
- Speak in Unison: Per nature of the Delightful Children, the souls that the Delightful Reaper assimilates all speak at the same time as they do. Although Billy has trouble following along.Billy: Hey! Can you guys slow down? This "talking at the same time" is really hard.
- Suddenly Shouting: Much like in his own cartoon, Eddy speaks in a calm and neutral tone, until he gets frustrated and starts screaming his sentences at the top of his lungs.Eddy: Ed, Edd n Eddy's Pesky Problem Fixers! Got a problem that's pesky? We'll fix 'er, for just one lousy quarter! [muffled gobbling from Billy] WHADDAYA MEAN, YOU'RE BROKE?! Hey! If you're looking for charity, call Kids Next Door. They're cheap.
- Took a Level in Dumbass: The entirety of Kids Next Door, with the exception of Numbuhs 1, 2 (he was already assimilated with the Delightful Reaper the time), and 5, become much more idiotic in this cartoon in order to facilitate Mandy's takeover of the organization. Special mention goes to Numbuh 362, who in her home series is one of the most intelligent and understanding characters of the entire show, yet is among those who are duped by Mandy's ridiculous disguise as Numbuh 1, not realizing her mistake until after Mandy usurps her and throws her in the Moonbase prison.
- Villain: Exit, Stage Left: Mandy manages to escape the KND with rockets coming out of her hair.
- We Are Not Going Through That Again: As described in Here We Go Again! above. Billy attempts to become the Supreme Leader of the organization, prompting the Kids Next Door, as well as Grim, to throw stuff at him.
- What Happened to the Mouse?: There's no mention as to what became of the Delightful Children after the DR was vanquished.
- You Meddling Kids: Mandy says she would have gotten away with it [world domination] if it wasn't for those meddling Kids Next Door.
