The Grim Adventures of Billy & Mandy (season 1)

Country of origin	United States
No. of episodes	10 (26 segments)
Release
Original network	Cartoon Network
Original release	June 13, 2003 – October 31, 2003

There were 9 regular episodes in this season, and the half-hour Halloween special, in which Billy, Mandy and Grim face against Jack O'Lantern.

This season introduces the boy-wizard Nigel Planter and supporting characters such as Dean Toadblatt, which constitutes a parody of the Harry Potter franchise. Other characters that make major appearances include Mandy's nemesis, the popular and snobby Mindy; Nergal Junior, the son of Nergal, and Billy's aunt Sis; and Jeff the Spider, who is hatched from an egg by Billy.

Other characters that return are Hoss Delgado, who battles zombie brownies alongside Billy; and Eris, who keeps scheming to create chaos.

Episode list

The Grim Adventures of Billy & Mandy season 1 episodes

No. in series	No. in season	Title	Directed by	Story by	Storyboard by	Original air date
1	1	"Toadblatt's School of Sorcery/Educating Grim/It's Hokey Mon!"	Robert Alvarez Juli Hashiguchi John McIntyre & Robert Alvarez	Ben Spergel Rachael MacFarlane Gord Zajac	Mike Diederich & Maxwell Atoms Brett Varon Mike Diederich	June 13, 2003 (2003-06-13)
Toadblatt's School of Sorcery: In a parody of the Harry Potter series, Grim sends Billy and Mandy to a sorcery school so the latter duo could avoid boring summer camps they were supposed to go to. The sorcery school is owned by Dean Toadblatt, an anthropomorphic frog. Billy and Mandy are sent to the most hated house on the school, Weaselthorpe, while Grim becomes a prefect for a more loved house, Gunderstank. Billy and Mandy team up with boy wizard Nigel Planter to sabotage Gunderstank. Planter takes all the credit for the sabotage (which was Mandy's idea), but he is punished once he is found out by Toadblatt. Educating Grim: Billy and Mandy take a reluctant Grim to school with them. Mandy's nemesis, Mindy, befriends Grim to annoy Mandy and Billy calls for their other friend, who is Abraham Lincoln. Mandy devises a plan in which Mindy ditches Grim, and keeps Abraham as her friend instead. It's Hokey Mon!: After watching Billy and Irwin play with their "Hokey Monsters" cards (parodying the Pokémon Trading Card Game), Grim makes the monsters come to life. Soon, all the other kids want their own cards to be real too, and the city is soon under attack by a multitude of Hokey Monsters. To put an end to the mayhem, Mandy draws her own card, Mandy's Monster, which defeats all the other monsters by turning them into toast.
2	2	"Night of the Living Grim/Brown Evil: Part 1/Brown Evil: Part 2"	Juli Hashiguchi Robert Alvarez Pat Shinagawa	Gord Zajac	Spencer Laudiero Paul McEvoy	June 20, 2003 (2003-06-20)
Night of the Living Grim: Grim is lying sick in bed with "Encroaching Doom Syndrome". The Underworld doctors are not able to help Grim, and he becomes a human being. Back in Endsville, Grim seems attractive to women, but he ends up being punched by jealous boyfriends, especially Billy's dad Harold. Grim covers himself in the mucus that he produced when he was sick and becomes a skeleton again, and Billy tries it too. Brown Evil: Part 1: Taking inspiration from his Pat the Baker video game, Billy decides to bake chocolate brownies. Billy uses "Evil Powder" from Grim's old trunk instead of salt, and the resultant brownies stink. Mandy tells Grim to get rid of the brownies, and he reluctantly does, but he also stores some of them in his skull. Soon, the stench of the brownies spreads through the world and starts resurrecting dead people, animals, and even food, as zombies. Brown Evil: Part 2: Billy and Hoss Delgado, spectral exterminator, team up to destroy all the zombies that congregate outside the house, but the zombies reassemble into a bigger zombie. Delgado realizes that the zombie is after the brownies that Grim has in his skull, so Delgado and Grim battle furiously for them. The zombie eats the remaining brownies and falls apart.
3	3	"Mandy, the Merciless/Creating Chaos/The Really Odd Couple"	Pat Shinagawa John McIntyre & Randy Myers	Gord Zajac	Alex Almaguer Brett Varon Mucci Fassett	June 27, 2003 (2003-06-27)
Mandy, the Merciless: On a hot day when Billy, Mandy, and Irwin are bored, Grim uses a crystal ball to show them the future. In the distant future, Mandy has turned herself into a giant worm-like creature to be immortal, and now rules the whole world. Mandy gives false information to a clone of Billy to capture the members of a resistance that try to defeat her. The episode parodies the science fiction novel God Emperor of Dune by Frank Herbert. Creating Chaos: When Billy, Mandy, and Grim go fishing, Eris, the goddess of chaos, gets Billy to help her use the Apple of Discord to create chaos (after her father grounded her). Instead of using the apple, Billy becomes distracted with his own idiotic errands, leading Eris to go insane. Billy finally decides to start creating chaos, but Eris is already too altered that she runs away. The Really Odd Couple: Billy accidentally sets off a powerful stink bomb in Mandy's house and, while the house is being disinfected and fumigated, Mandy's family goes to live with Billy's. Billy and Mandy have a dispute over how to split Billy's room, prompting Grim to intervene. Mandy takes over the entire room, and imprisons Billy inside a brick wall with his mouth gagged by a dark red handkerchief..
4	4	"Who Killed Who?/Tween Wolf"	Pat Shinagawa, John McIntyre, & Randy Myers Pat Shinagawa	Gord Zajac	Paul McEvoy Mucci Fassett	July 4, 2003 (2003-07-04)
Who Killed Who?: After excluding Mandy from their board game Who Killed Who? for being a girl, Billy and Irwin mistakenly throw their dice into the backyard of a haunted house. Grim warns them about the ghost of Mrs. Doolin, a lady that lived there. Mandy dares to go inside to retrieve the dice, and she befriends Mrs. Doolin, who is alive and well, and who says that all the stories told about her (that anything that went beyond her fence into her garden never came back) are inventions from Grim, whom she beat long time ago at a staring contest. Fearing for Mandy's life, Billy also ventures into the house, but Mrs. Doolin and Mandy scare him away by posing as ghosts. It appears that Mrs. Doolin is in fact a ghost, and when she meant "beating Grim", it meant that she "beaten death". Tween Wolf: After when Grim fails to pull a werewolf out of his hat, Irwin is bitten by said werewolf. Billy takes Irwin as his new pet dog, naming him Sprinkles, and enters him in the Endsville Dog Show to compete against Mandy's dog, Saliva. At the contest, Sprinkles is about to win, so Grim releases a "were-flea" whose bite causes the werewolf to revert to a naked Irwin. It appears that Irwin won the contest anyway.
5	5	"Grim in Love/Crushed/Love is Evol Spelled Backwards"	John McIntyre & Robert Alvarez Juli Hashiguchi	Gord Zajac Craig Lewis	Brett Varon Paul McEvoy	July 11, 2003 (2003-07-11)
Grim in Love: When Billy, Mandy and Grim go to the beach, Grim falls in love with a goth woman named Malaria. Grim is having a good time with his girlfriend, but Mandy assures him that will change when he tells her that he is not human. In the following date, Grim demonstrates his supernatural powers while dancing and, as predicted, Malaria leaves in panic. Crushed: At school, Mandy rejects Irwin's invitation to go to the school dance with him. Billy introduces his foreign and mysterious, new friend, "Piff", and Mandy becomes desperate when she realizes that she has developed a crush on him. Mandy asks Grim to cut her heart out to stop being in love, but Grim has a better idea and gives Mandy a makeover. Piff gets a crush on Mandy, who takes the opportunity to brutally turn him down. Love is Evol Spelled Backwards: It's Valentine's Day and Nergal, the fiend living in Earth's core, appears in Billy's house to court Billy's spinster aunt Sis. Billy tries ruining Nergal's date, to avoid becoming his nephew. Although initially Sis does not show interest in Nergal, she changes her mind when Nergal is stung by bees and she sees his "dance moves". Aunt Sis accepts Nergal's marriage proposal and accompanies him back to the center of the Earth.
6	6	"The Crawling Niceness/Smarten Up!/The Grim Show"	John McIntyre & Robert Alvarez	Maxwell Atoms Gord Zajac Craig Lewis	Maxwell Atoms David Feiss Trevor Wall	July 18, 2003 (2003-07-18)
The Crawling Niceness: Billy takes a big egg found in Grim's trunk and hatches it expecting a duck. Instead, Jeff the Spider is born, who considers Billy his father. Despite Jeff trying to please Billy in any possible way, Billy is terrified of Jeff and wants him squished. The exterminator chose not to squish Jeff because he is a nice bug. Smarten Up!: Billy is worried about failing an upcoming Math test, so Grim gives him a "bookworm", which will make him much smarter. Milkshakes, Billy's cat, eats the worm instead, and is forced to tutor Billy. Billy is still an idiot in the end. The Grim Show: Grim is upset after his favorite show, Atrocia's Late Night Atrocities, is cancelled. He goes to the TV station and using his powers, turns the studio into a creepier place and becomes the host of the Grim Show. Grim's success on TV is interrupted when Mandy tells him he has neglected to do her chores. Billy and Mandy go to the TV station and show embarrassing footage of Grim at home.
7	7	"Son of Nergal/Sister Grim/Go-Kart 3000!"	Robert Alvarez John McIntyre & Juli Hashiguchi John McIntyre & Randy Myers	Gord Zajac	Paul McEvoy Brett Varon Michael Diederich	July 25, 2003 (2003-07-25)
Son of Nergal: Billy and Mandy are sent to "Winter Camp", where they meet Nergal's son, Nergal Jr. Just like his father, Junior tries making friends, although not in the best way possible. Junior attacks the campers, freezes them and, using his shape-shifting abilities, takes over their appearances. Billy decides to be Junior's friend, but he is scared away at the moment Junior shows him his true form. Sister Grim: After being accidentally hit by Billy, Grim lands in a can of white paint in a remote convent. Due to his appearance, still with the can in his head, Grim is mistaken for "Sister Big Mamma" by little cherubic nuns. Grim has a great time with the friendly nuns, until Billy and Mandy come looking for him. When the nuns realize the truth about Grim they get angry at him, but also help him go back home by sending him flying away with another punch. Go Kart 3000!: When Billy and Irwin exclude Mandy and Grim from helping them build a go-kart to enter the Annual Endsville Go-Kart Competition, the latter two decide to build their own. Billy-Irwin, and Mandy-Grim compete against Mindy, Sperg, and a mystery racer (Pud'n). Mindy gets stuck in highway traffic, Billy-Irwin's car is destroyed, Sperg and Grim mutually prevent each other from winning, and Pud'n wins in his little red wagon.
8	8	"20a Terror of the Black Knight / Battle of the Bands / The Halls of Time"	Juli Hashiguchi Robert Alvarez John McIntyre & Randy Myers	Craig Lewis Gord Zajac	Alex Almaguer Brett Varon Mike Diederich	August 1, 2003 (2003-08-01)
Terror of the Black Knight: After being impressed by Irwin's realistic armor at the medieval fair, Billy wishes for a fancy armor too. Grim gives him the "Cursed Suit of the Black Knight". When Billy needs to go to the bathroom, the curse is revealed to be that the armor cannot be taken off until the person wearing it beats someone in a competition. Billy desperately tries to defeat other people at various contests, he but fails to come out victorious. He defeats Mandy at a breakdance contest in which Mandy decided not to participate, but he does not need to go to the bathroom anymore. Battle of the Bands: Billy wants to join Sperg's garage band, "Purple Filth", and take part in the upcoming battle of the bands. After witnessing Grim's prowess with the electric guitar, Sperg invites Grim instead. Billy's dad, adopting the rock and roll persona of "Mogar", decides he and Billy should go to the contest to make a surprise appearance. Billy impresses the audience with his armpit sounds. The Halls of Time: After missing on a school trip, Grim takes Billy, Mandy and Irwin to the "Halls of Time" for a tour. There, Billy and Irwin mess the hourglasses that symbolize each person's lifespan. When they leave, they accidentally leave their own hourglasses, including Grim's, upside down, resulting in the group getting younger as time passes. Grim allows the kids to disappear by going before birth, but he cannot restore his own hourglass to its correct position and he disappears too.
9	9	"Grim for a Day / Chicken Ball Z"	Robert Alvarez Juli Hashiguchi	Craig Lewis Ben Spergel	Paul McEvoy Matt Sullivan	August 15, 2003 (2003-08-15)
Grim for a Day: After a lousy night for Grim, Billy and Grim argue about who has the hardest time, the kid or the Reaper of Souls. Mandy proposes they switch places for the day to find out. Grim seems to be having a good time, acting like a silly kid, while Billy is bored waiting for his old victim, Mr. Voorhees, to open the door. Billy transforms into a short skeleton, while Grim transforms into a taller version of Billy. Chicken Ball Z: Grim's refusal to help Mandy win a karate tournament, and the $50,000 prize it promises to the winner, leads her to a curio shop, where the shopkeeper, Kuan Ti, gives her an ancient "Chicken Ball" which, when eaten, allows her to become a great fighter. Mandy easily wins the tournament and does not care about the money anymore, only about fighting. It turns out Kuan Ti is actually Eris in disguise, and this was just another of her schemes to create chaos. Seeing how he has a chance to get rid of the kids and finally be free, he tries to take advantage over this by making Billy a superb fighter too, so he and Mandy can fight ferociously to the death until the entire arena is destroyed. With both still alive, Mandy still demands the prize money, which she uses to buy Hector Con Carne's Bunny Island.
10	10	"Billy & Mandy's Jacked-Up Halloween"	Juli Hashiguchi & Robert Alvarez	Maxwell Atoms, Brett Varon, & Paul McEvoy	Brett Varon & Maxwell Atoms	October 31, 2003 (2003-10-31)
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, but signed it "From: Jack"; in consequence, the angry queen sent a knight to kill Jack. When Grim went for Jack's soul, Jack stole his scythe. In return for his scythe, Grim promised Jack eternal life, but after closing the deal, Grim takes his scythe and cuts Jack's head off, showing that no one will "EVER" see his face again. Afterwards, Jack decided to use a pumpkin for a head, becoming Jack O'Lantern, and, suffering from the loss of his real head and learning his lesson about pulling pranks too far and whom he does them to, every Halloween he goes out to pull pranks on the citizens of Endsville, and waits 364 more days a year until next Halloween in solitary mode in his own house. After hearing the story, Billy splits from the group and finds Jack's house downtown. Jack realizes Billy is carrying the actual Reaper's scythe, so he takes it from him and uses it to open the gates of the Underworld and bring forth ghosts, which cause havoc in the city. Jack then plans to get revenge on Grim by cutting his head off which, being cut with the Reaper's scythe, will stay off "forever". To stop Jack from carrying on with his vengeance, Mandy sets up a series of pranks for him. The pranks affect Irwin instead, causing major laughter from Jack and his ghouls, which explode and return to the Underworld. Grim recovers his scythe and sends Jack to the Underworld too.