The BEST Episodes of The Grim Adventures of Billy & Mandy
Every episode ever - ranked by fan votes!
Last Updated: Dec 8, 2019
Network: Cartoon Network
A show featuring the exploits of the Grim Reaper, forced into being the best friend of two children.
#1 - Billy & Mandy Moon the Moon
Season 7 - Episode 15
When Billy is sent to bed after playing with his Dr. Brainiac action figure, he wishes he had an adventure. Then, he notices a strange light outside and wanders into a corn field to investigate; there, he encounters Sperg, and they are both abducted by aliens who experiment with them. Later, when they return home, it is revealed that Sperg has a bomb implanted in his head, and also that there is a shortage of dairy products; Billy explains that the aliens are stealing Earth's dairy products because they are werewolf-like creatures who need cheese, and they have already mined all the cheese in the Moon. In the following, Billy's crazy story is confirmed when too many UFOs appear. Then, Billy says they must assemble a team of diary superheroes, the Green Squeaker (Billy), Milk Mandy, the Cheese Reaper, and Diary Boy (Sperg), to combat the aliens, but everybody is opposed to the idea. Later, the four of them have been captured and are sent to the Moon to be destroyed, but they escape and try to stop the Moon ship from getting to Earth. At that time, the Moon aliens start their transformation into werewolves, and they bite Billy, who becomes a werewolf too. With their backs to the wall, Grim finally chooses to give Billy, Mandy and himself their dairy superpowers. Meanwhile, Sperg sacrifices himself by letting the bomb in his head explode in the control room, thus crashing the spaceship in the Moon and saving Earth. A final segment shows what happened to Billy, Mandy, Grim, Sperg, Dr. Brainiac, and even the Moon people, that remain attempting to destroy the humans by extracting their brains to steal their knowledge after they discussed and revealed their master plan to escape with Endsville's supply of cheese while showing images of the characters from the other shows in the the crossover Cartoon Network Invaded which meant that they were the masterminds behind the entire event.This was the fifth and final chapter of Cartoon Network Invaded which also concluded with an
#2 - Hurter Monkey
Season 6 - Episode 19
When Mandy says even a trained monkey is more competent to do cleaning chores than Grim, and would complain less, Grim makes Dickie Galoot, a monkey appearing in a Japanese-styled animation, come to life to prove her wrong. Then, as Dickie turns out to be extremely good at cleaning Mandy's house, Grim decides to leave the kids for good; however, due to his friendship contract, Grim is unable to break free, and so he is forced to battle Dickie to recover his place as the "cleaning monkey" of the group. In the end, Grim successfully defeats Dickie at cleaning Billy's house, but this all turns out to be an ingenious plan devised by Mandy to win a bet against Billy.
#3 - Anger Mismanagement
Season 7 - Episode 10
As General Skarr has trouble finding a job, the recruiter tells him to attend anger management classes if he wants to work again. Then, Skarr finds out Mandy and Grim are attending too, Mandy for staring at the school monitor, and Grim for enjoying too much his job. The instructor of the class, Larry, turns out to be a peace-loving, short man riding a tricycle, who teaches the trio ways to calm down when angered, including counting to ten, and using harmless weapons to let go of their anger. In the end, Larry invites Billy to the class, and Mandy, Grim, and Skarr all manage to contain themselves; however, Larry himself suffers an episode of rage over a parking space and he is arrested.
#4 - Billy and Mandy vs. the Martians
Season 6 - Episode 14
When Billy destroys Grim's favorite childhood toy, Fancy Jake, Grim feels devastated and wishes he had never lost the limbo game that made him become Billy and Mandy's friend. Then, a lawyer appears saying that although the game is legally binding while all parties remain on Earth, it is not if Grim leaves Earth. In consequence, Grim follows the lawyer's advice, opens a portal, and leaves. Then, with Grim travelling aboard his spaceship, the lawyer takes off his disguise and introduces himself as Morg, the Martian Grim Reaper, who is also Emperor of Mars and commands an army of martian, brain-eating zombies. Then, so Grim can get the respect he deserves, Morg convinces Grim to conquer Earth, which they do easily while enslaving and turning all the people into zombies. Next for the reapers is to use the ultimate weapon in mind control, the Braincaster, which, if powered by a dumb mind, will allow them to control all the zombies forever. Meanwhile, Billy, Mandy and Irwin, who followed Grim to Mars hidden in his bottomless trunk, look for a way to save Earth. Then, when the kids are captured, and Billy is strapped to the Braincaster, all hope seems lost; however, at the last minute Billy talks to Grim about friendship, and Grim has a change of heart and decides to help Mandy. In the end, Billy's stupid brain overpowers the Braincaster, returning all the people to normal and foiling Morg's plan, who disappears into outer space.
#5 - The Wrongest Yard
Season 6 - Episode 8
In order to become cool, Billy and Irwin join a football team, so they won't get bullied anymore. Meanwhile, Mandy took over Mindy's position as the new cheerleader captain.
#6 - Dad Day Afternoon
Season 6 - Episode 17
As Billy and Mandy celebrate Father's Day, Grim becomes very depressed that he sits inside Billy's closet only listening to country rock music. Then, Grim explains that, since his own father cared more about country rock than about him, he has been living a lie, telling his father he is a famous country rock singer, and not the actual Grim Reaper. Then, Mandy arranges for Grim's dad to come visit and she tells him the truth, but still the old man doesn't believe her. Grim decides that the only way for his dad to listen to him is while performing country music. Then, at an outdoor concert, Billy, Mandy and Grim start performing a country rock song, in which eventually Grim reveals his supernatural powers. In the end, Grim's dad accepts his son is the Reaper, but still doesn't forgive him.
#7 - A Grim Day
Season 6 - Episode 12
When Grim gets a day off at the same time when Billy visits his grandma and Mandy does her home spa treatment, he spends his time dealing with huge lawn gnomes when Skarr takes his scythe. With both Billy and Mandy busy, he ends up getting help from Mindy and Pud'n.
#8 - Spidermandy
Season 6 - Episode 21
When Billy finds his "son" Jeff the Spider lying in his bed with "Spider Pox", he goes to Mandy for help to get rid of the giant spider. While ignoring Billy, the next morning Mandy awakens afflicted by Spider Pox too, developing four additional arms and the ability to produce spider web. Later, Mandy's condition progresses and she completely turns into a giant spider, who then captures Billy's parents and Grim. Then, Grim tells Billy that, to cure Mandy, he must use the venom of the spider that infected her. In the end, while Billy successfully gives Mandy Jeff's venom, he also carried the virus and infected the people of the city, who all turned into spiders.
#9 - Short Tall Tales
Season 7 - Episode 17
As Billy, Mandy, and Irwin need to write a school report on tall tales, Grim tells outrageous tall tales about Pecos Billy (based on Pecos Bill), Paula Bunyan (based on Paul Bunyan), and John Henry. In Grim's stories, Pecos Billy (Billy) tames a twister using his personal laser-shooting cow-like spacecraft, saving an Arizona trailer park; Paula Bunyan (Mandy) uses her blue ox companion, Babe, to stomp over a villain, creating the Grand Canyon in the process; John Henry (Irwin) digs through a tunnel so fast that he breaks the laws of Physics and bursts into the "8th dimension". After Grim tells them the stories, Mandy informs Billy and Irwin that he is trying to get them F's.
#10 - Reap Walking
Season 5 - Episode 6
When the mall's surveillance cameras capture Grim's silhouette attacking endangered owls, a naturalist named Corey Nebraska blames Grim for the attacks, while Mandy suspects Grim is sleepwalking again. Then Billy, Mandy and Nebraska follow Grim while he sleepwalks, but they realize it is actually Gladys, Billy's mom, the one attacking the owls. When discovered, Gladys reveals her hatred toward the owls as she recounts the story on how an owl ate her pet rat, Sniffles, years ago. In the end, Billy's dad reveals that he was in fact the one who ate Sniffles merely to survive until lunch time. Note: this is the only episode without a title card
#11 - Dumb-Dumbs & Dragons
Season 6 - Episode 15
As Billy sees Hoss Delgado's manliness is action again, Billy wishes to grow up to be like him, in other words, to be a hero. Then, Grim tells Billy that in older times an evident way to become a hero was to slay a dragon, so they travel to the Middle Ages so Billy can train under the supervision of the best dragon slayer, Sir Boss Del Guapo, who resembles the present time Delgado. In the end, Billy becomes friends with the dragon he was supposed to kill and spares his life, becoming the dragon's hero. Also, Del Guapo finds himself transported to the present, where he has brief encounter with Delgado.
#12 - Modern Primitives
Season 6 - Episode 6
While Billy was trying to dig his way to the Earth's core, he stumbles upon a frozen caveman. It's Fred Flintstone! Grim and Billy thawed him out of the ice. Grim wants to reap Fred's soul, but Billy wants to keep him as a friend. At school, he presented the caveman to the class. Then Fred goes crazy and kidnaps Mrs. Butterbean.
#13 - El Dia de Los Muertos Estupidos
Season 7 - Episode 20
When Billy's dad drives Billy, Mandy and Grim to the hamburger restaurant, they somehow end up in Mexico. There, the people are celebrating Dia de los Muertos, but local kids say it may be the last celebration ever, because Del Uglio, a masked and ugly luchador, is set on stealing the "Golden Nose of Chipotle", a prehispanic relic on which the festivity is based. To get to the nose, Del Uglio has one half of the map, while the other half is held by his lost twin brother, who turns out to be Billy. In the end, Grim defeats Del Uglio, but it is Mandy who keeps the golden nose for herself, which makes her rich.
#14 - Pandora's Lunch Box
Season 6 - Episode 13
When a girl named Dora comes to Billy and Mandy's school, she and Mandy become instant friends. While watching Mindy and the cheerleaders, Dora tells Mandy that if she opens her lunchbox. There's something that could destroy Mindy. Since Mandy wants to destroy Mindy, she opens the lunchbox, unleashing evil demons shaped like food. It turns out that Dora is actually Pandora, and she tricked Mandy into unleashing all of the demons. Mandy, angry that Dora tricked her, stops the end of the world by sucking the demons and Dora into the lunchbox.
#15 - The Greatest Love Story Ever Told Ever
Season 7 - Episode 13
When Irwin lacks the courage to ask Mandy to go with him to the Valentine's Day school dance, he tells Nergal Jr. to do it for him. Then, Mandy mistakes Junior's invitation for his own, and surprisingly accepts to go with him, which naturally makes Irwin jealous. Then, with the ill advice received from his father, to be possessive with Mandy, at the dance Junior becomes overprotective of her, that eventually he and Irwin start fighting, throwing punch at each other and ruining the ball. In the end, it is revealed that this was Mandy's true intention all along so that no one could enjoy Valentine's Day.
#16 - Mommy Fiercest
Season 5 - Episode 4
When Billy's mom, Gladys, discovers crow's feet on her face, she panics and doesn't want to leave the bathroom. As Grim needs to use the bathroom, he uses his scythe to make Gladys a young girl again, thus without wrinkles. Then, Gladys goes to see Billy, but neither he nor Mandy nor Irwin recognize her, and instead, Billy calls her "Corn", because of the white bread she gave him. Then, when Corn tells Billy to do his homework, Mandy tells him to go to the movie theater instead. In consequence, Corn and Mandy struggle over who gets to control Billy. In the end, Billy's father, Harold, plays with Grim's scythe and also becomes a child; he then goes to the movies and gets together with Gladys (Corn) again.
#17 - Waking Nightmare
Season 7 - Episode 11
When Mandy finds Billy playing with Grim's gigantic dog, Cerberus, she tells Grim to keep Billy under tight control because she needs a good night of sleep to be ready for the next day's test. Then, with a little persuasion from his own dad, Billy tries to wake up Mandy at night, so she will fail the test and he can score higher than her for the first time. After Grim spends the night guarding Mandy's house from Billy, the latter apparently succeeds in waking up Mandy. However, it is revealed that this Mandy is in fact Irwin, used as a decoy by the real Mandy, who slept in her dog's house. In the end, Mandy passes the test, and Grim is punished for not guarding her properly.
#18 - The Secret Snake Club
Season 4 - Episode 1
At school, Billy, Mandy and Irwin look for a club to join. Irwin plans to join the Macrame club in order to meet girls; Billy inquires on the Junior CIA club, which forcefully recruits him; Mandy joins the "Secret Snake Club", a snake-themed club consisting of three geeks. In their headquarters, the nerds reveal that their "secret agenda" is to resurrect Shnissugah, a giant snake which lived hundreds of years ago in Canada, to take revenge against the popular kids, but they lack the power of the Underworld to do so. Then, Mandy calls for Grim, who proceeds to revive Shnissugah through the internet. In the end, Billy, as a junior agent of the CIA, stops a criminal plan by Irwin, who was using the Macrame club for personal gain; and Shnissugah turns out to be a tiny, 8-cm (3.14-in) long, harmless snake.
#19 - Dumb Luck
Season 3 - Episode 3
After spilling salt in a restaurant, and not throwing salt over his left shoulder, Billy starts having an unusual amount of bad luck. The next day, Grim analyzes Billy and finds out he has a "Catastrophe Snail" attached to his brain, which is causing him the bad luck.
#20 - Chaos Theory
Season 6 - Episode 11
While at Costmo, the gang finds out that everything is too orderly. After talking to Hoss Delgado about it, they discovered that's because he's dating Eris. There isn't that much chaos anymore. So it's up to them to "stop order from taking over."
#21 - Duck!
Season 4 - Episode 15
After Grim has a nice dream, a nightmare escapes the back of his head in the shape of a supernatural, invisible duck that makes farting noises. Then, the duck follows Grim everywhere, causing him embarrassment with the non-existent farts, and to end up in jail. Then, the duck repeats the strategy, following other citizens, including Irwin and Billy's dad, resulting in all of them going to jail too. Finally, the duck tries to annoy Mandy, but she remains imperturbable by its presence, and eventually the duck disappears and Principal Goodvibes is really super angry to give mandy 75 days of detention.
#22 - Dracula Must Die!
Season 7 - Episode 16
When vampire hunter Lionel Van Helsing prepares to kill Dracula, Billy, Mandy and Grim arrive to stop him, since, after all, Dracula is just senile and harmless. Then, Van Helsing reveals the source of his hatred: in the past, he and Dracula were "best friends forever", until Dracula used his irresistible dance moves to marry Tanya, the woman of his dreams. Later, Tanya arrives too, revealing that she is none other than Irwin's grandmother, making Irwin half-vampire on his father's side, and half-mummy on his mother's side. In the end, Van Helsing leaves, but Dracula is unsatisfied with his newfound family of nerds.
#23 - Who Killed Who?
Season 2 - Episode 10
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. However, it appears that Mrs. Doolin is in fact a ghost, and when she meant "beating Grim", it meant that she "beaten death".
#24 - Herbicidal Maniac
Season 6 - Episode 10
Skarr was doing a lot of gardening in order to win the "Good Neighbor Award". When he spotted a weed, Skarr tries to exterminate it. He called Grim for assistance. Then Billy comes and ruins Skarr's garden with the mower. Strange glowing tendrils wrap Skarr around and gave him the powers to bring plants to life.
#25 - Wild Parts
Season 4 - Episode 8
One night a strange odor travels through the city, prompting the noses of all the people, including Billy's, to follow it. The next night, Mandy, who is noseless, and Grim decide to wait outside Billy's house for the event to repeat. Then, when the odor reappears, the nose parade leads them to the shopping mall, where they meet a "Nasalmancer", a nose wizard, who is trying to take over other people's noses since he lost his own. In the end, Billy recovers his nose, but slices it in two, and gives one half to the Nasalmancer.