A frozen monster is laying siege to the frozen foods aisle at the Joliville supermarket. Can the Monster Agency stop him before he turns all the customers into frozen treats and eats his way through the Averages’ favorite flavors of ice cream?

When they arrive at their vacation spot, Matt and his family discover that a mysterious monster has been terrorizing the lake and making it impossible to go swimming. They decide to have a closer look. The Agency van turns into a submarine and our heroes plunge into the watery depths…

Matt’s grades are getting worse and worse. Ellen and Bruce take drastic measures: no more monster hunting until further notice! Matt has to stay home and study hard to improve his test scores. But a mysterious companion disturbs his efforts…

A mysterious monster comes out of the faucet and attacks Matt while he’s in the tub. Ellen thinks Matt is just trying to find a way to get out of taking a bath! When Ellen hears reports of other attacks in Joliville, the Agency gets involved, but the monster escapes. To protect the people of Joliville, the water is cut off throughout the city…

Madame Bovary has found a foolproof way to capture monsters: hypnotize them. The Monster Agency can’t compete with a skill like that, so they get ready to shut down… but are Bovary’s powers as real as she claims?

Madame Bovary decides to deal a fatal blow to the Monster Agency. While Matt’s parents are away, she kidnaps Dink. This is more than Matt and Manson can bear. They soon find Dink but discover that he’s on Bovary’s side now…

Mika doesn’t like being on a diet very much. When Bruce and Matt go shopping for a new telephone to replace the one that Mika gulped down, Mika follows them in the hope that he can eat a little more on the sly! But that’s nothing in comparison to what is awaiting the Agency: a mold monster is attacking the store Joliville’s garbage is up in arms!

An enormous trash monster is spreading terror among the citizenry and the garbage men. Will the Averages, skilled sorters that they are, manage to stop the creature and restore tidiness to the city?

Manson, Matt, and their friend Sonia are going to visit a huge aquarium. When they get there, the find the guards paralyzed as if in a hypnotic trance! When even the sheriff is hypnotized, there’s no more room for doubt: a monster is hiding among the fish in the aquarium… so the Monster Agency decides to do a little deep-sea fishing!

The cars of Joliville are breaking down one after the other. It turns out the motor oil is the favorite food of the latest monster to attack the city. The Monster Agency must protect the last garage in town (that still has oil) from the ravenous creature.

During a perfectly normal monster hunt, Matt, Bruce, Dink, and Manson awaken a sleeping Gagab. The monster, who normally hibernates underground twelve months a year, is blinded by rage and begins to plunder the town. He has to be stopped, but how? He has to go back to sleep, which is no easy task for a Gagab once he’s awake…

A pink monster is making the people of Joliville see the world through rose-colored glasses. It transmits its virus to grumpy people by blowing huge bubble gum balls. And they’re immediately all smiles and deliriously happy! Can the Monster Agency stop the virus from spreading before the entire town is wallowing in happiness?

During a garage sale, Grandma Average sells her old jukebox to the Schwarzes. When they get home and plug it in however, the juke box turns into a “Juke Monster”, a creature capable of destroying the city with sound waves. The Monster Agency has to stop the monster before it starts an earthquake.

During a school field trip, the students in Matt’s class disturb a mysterious forest creature in its lair. The monster seeks its vengeance by covering Joliville with fog!

A new monster is spreading terror throughout the city. The Monster Agency wastes no time, and it puts up a sketch of the terrible creature. And surprise: the eyewitnesses are all in agreement: it’s…Dink! Matt gets ready to do anything to prove the innocence of his faithful companion.

The Bovary Company does such a good job of sabotaging the Monster Agency’s ad campaign that they’re no longer receiving any calls. Ellen decides to do something about it, so she comes up with a promotional offer: a free household chore for every monster captured. It works, and customers start to come back! But the members of the Agency are exhausted from doing everyone’s chores…

Matt has to track down a monster that is destroying all the sources of light in the city. Nothing should be easier for a monster expert like Matt unless he’s surrounded by a group of blissfully unaware senior citizens, who have come to the Monster Agency open house!

One morning, the city wakes up covered in holes. Buildings, cars, notebooks, dirt, cups: everything has holes in it as if a colony of termites had infested the city! Matt and the Agency are called to help, and they soon discover that this destruction is in fact the work of a monster who likes to punch holes in everything!

An unusually speedy monster called the Ludofractor is attacking children’s toys, and each time the Agency arrives on the scene, it’s too late. To trap the monster, Matt forms an alliance with Socrates, who has the biggest toy collection in Joliville. But with such a selfish ally, surprises are bound to be in store…

The Monster Agency is celebrating the capture of its 5000th monster. The press is gathered for the occasion, and Matt, Bruce, Ellen, and Dink tell the story of how they got started in monster hunting, when Matt was just a baby and Dink was still a wild monster…

A monster is hiding in the hotel where the famous rock group The Scalps are staying. Anyone who comes into contact with the monster starts to sprout hair and a beard that grow at an astonishing rate. Which is bad luck for Matt and Manson, who have gone to interview the group!

It’s Christmas in Joliville. Bruce’s mother has joined the Averages and the family is getting ready to enjoy Christmas dinner. But a monster alert spoils the evening’s festivities. A creature is attacking the city’s decorations. Grandma Average thinks that this is the work of the infamous Masskriss, a monster who wants to destroy Christmas…

Manson is rehearsing a rock song in the Averages’ garage in the hope that she can play with her favorite group, Metal Finish. But her voice attracts a wavosaurus, and the monster shows up at the Averages and kidnaps Manson!! Matt has to save his friend, even if it means having to listen to her sing!

Matt is invited by his friend Sonia to the brand new multiplex in town to see Mr. Bunnylumps and His Cuddly Friends, and Dink and Manson, who are going to sea monster movie, have no end of fun at his expense! But when one of the monsters literally jumps out of the screen, Matt has to find a way to save the day without disturbing Sonia and keep the multiplex from descending into panic!

A bubble-like monster hides in a water-cooler at Matt’s school, causing its particles to eventually inflate everyone who drinks from it. After realizing the monster just wants to cool down, Matt and co. lure it into a refrigerator, which causes the monster to summon all of its particles from those still infected and deflating them. They send the fridge to Antarctica, where the monster then proceeds to inflate several penguins there.

A mysterious monster is turning children’s dreams into nightmares! This means all the kids show up for Mr. Rasmussen’s class completely sleep-deprived. For Socrates, the reason is clear: it’s all Matt’s fault for always telling monster stories during recess! Will Matt be able to flush out the nightmare monster and regain his rightful place among his friends?

After his car is crushed during a monster hunt, Sheriff Wayne discovers that the Agency’s monster hunting license has expired. They have to take the test all over again! As if things weren’t bad enough thanks to a fussy test monitor who’s all theory and no experience, the plot really thickens when the Bovary Company decides to prevent our heroes from regaining their license by any means necessary!

Bovary can’t stand the Spring Festival that the town’s inhabitants put on every year, This time, however, she’s decided to destroy it once and for all. When a monster that sucks the color out of everything arrives in town, she gets other ideas for spoiling the festival.

A group of monsters is meeting in secret because they’ve had all they can take from the Monster Agency! The Averages have been nothing but trouble since day one. A monster can’t even destroy a block of houses anymore without hearing from them! The monsters decide to kidnap the mayor of Joliville and replace him to gain control of the city and get rid of the Agency.

Ellen wants Matt and Bruce to stop filling up on candy. From now on, they’re allowed to eat only fruits and vegetables. Unfortunately, a monster has laid waste to all the farms in the area except for one! The Agency goes there to catch the creature or else Ellen can say good-bye to healthy meals!

Adrian is the smartest kid in the class, and he’s also really good at video games. So when a jealous Socrates tries to steal his game console from him, he has no idea that he’s about to unleash a monster capable of turning the entire city into a virtual world. And the Monster Agency has to come up with a way to put a stop to it!

Ever since Ellen launched her new advertising campaign for the Agency, she hasn’t been home as much. And Bruce has trouble keeping up with the daily housework. When Madame Bovary shows up and asks to be their housekeeper, Ellen sees a chance to help Bruce out while offering Mme Bovary a chance at redemption.

After failing a major opportunity to capture a monster, Bruce Average is overcome with self-doubt and decides to quit monster hunting for good. Seeking a simpler life, he starts a new career as a pizza delivery man. While Bruce tries to adjust to his new job, Matt refuses to give up on the agency. However, Matt quickly discovers that without an adult present, the children are not taken seriously by the citizens of Joliville, and the Monster Agency struggles to function. Matt must find a way to restore his father's confidence and bring him back to the team.

It is Halloween in Joliville, and the streets are filled with children in costumes, but the Monster Agency faces a unique crisis when real monsters decide to join the festivities. Because everyone assumes the creatures are just people in high-quality costumes, the monsters are able to cause chaos without being detected by the public. Matt, Manson, Dink, and Bruce must find a way to track down and capture the real threats hidden among the trick-or-treaters. The mission becomes even more complicated as the team tries to save the holiday without causing a mass panic that would ruin the celebrations for the entire town.

The city of Joliville is gripped by sudden, widespread fear as residents become irrationally suspicious of one another. Matt and the Monster Agency must investigate to determine if a specific monster is fueling this collective anxiety or if the chaos has a different source.

Sly the mailman is quietly delivering the mail on his bike when the fin of a monster comes surging up from underground and heads right for him! Sly manages to escape, but the effects of the incident are immediately felt. The people of Joliville are terrified and no longer dare to go outside or set foot on the ground! The Agency has to find the monster’s Achille’s heel to save the day…

​In Joliville, a gluttonous "Mail Monster" begins wreaking havoc on the city's postal system. The monster causes mailboxes to become "hungry," leading them to snap at passersby and shred letters into tiny pieces. As a result, mail carriers refuse to work, and communication in the city grinds to a halt.

The Average family’s house is suddenly invaded by a mysterious, thick, and foul-smelling slime. Matt and his team discover that the culprit is Jojo, the lake monster that thrives on filth and chaos. The team must find a way to clean up the city of Joliville and neutralize the monster before the entire town is buried under layers of grime.

Matt is finding monster hunting to be a little repetitive these days, and his mini-monsters are wearing him out. At school, he doesn’t even draw monsters in the margins of his tests anymore! Dink is very worried to see his friend lose his enthusiasm for monsters. He has to discover why Matt is bored with monsters, and fast…

After being exposed to sewer monster, Matt turns into a monster himself! It's a race against the clock to find the antidote for Matt before the vicious Madame Bovary captures him!

Sonia invokes an Indian curse that brings the city’s cakes to life. The Average Family is quickly entrenched in its house and surrounded by cakes that are led by a sinister Black Forest cake…

A monster is wreaking havoc wherever it goes! Sonia's parents' grocery store, Sly's mail delivery, the mayor's speech notes... everything is in disarray! The Monster Agency immediately sets out to track down this creature, but it's not easy to catch it when it's also messing up all the Agency's gadgets!

Professors and scientists are falling victim to a strange illness. Their once-high IQs seem to have vanished: they're becoming stupid! Our heroes investigate and discover that a monster is behind this rampant disease. But when Bruce is infected, the Agency's thinking abilities are seriously compromised...

A magnetic monster attracts all metallic objects to itself in order to devour them. The mayor, who has Dink in his sights for a prank he pulled at the unveiling of his statue, is convinced he's the one causing the chaos. He has Dink thrown in jail! The Agency, struggling to identify the monster, helps his little companion escape...

When a report about the Agency airs on TV, the public discovers the mini-monsters and finds them absolutely adorable. Soon, everyone wants a mini-monster at home! The Bovary Company immediately senses a new market opportunity and sells loads of mini-monsters. But not everyone knows how to care for them like Matt, and that's when the trouble starts...

It wasn’t the first time Manson talked about her monster/brother in class. But this time, Socrates challenges her to bring him in. If Manson wants to save face, she has no other choice than to go looking for her “brother” for real. Fortunately, she can count on the Agency’s help!

Matt hopes to impress the judges at the school sculpture competition. But with Theodore and Sonia, the competition is fierce! When the audience mocks Matt's creation, deeming it too "monstrous," the other students' sculptures are suddenly torn to pieces. Matt is accused of taking revenge for the criticism...

It's Dink's birthday. A power outage forces Matt's family to continue the party... in their van! Meanwhile, Professor Appendix creates a machine that brings shadows to life. His own shadow comes to life and absorbs all sources of light: in Bovary's mansion, but also throughout the entire city...

Manson makes a fool of herself with a floral outfit. But she's not alone: all the clothes in town are disappearing, and everyone's making do with what they have. The sheriff even has to walk around barefoot! Bovary and Appendix take advantage of the situation to launch a new clothing line. Could there be a monster lurking beneath the surface?

Ellen creates an advertisement for the Monster Agency. When it comes to choosing the monsters that best represent their work, all the Agency members give their opinions! But this advertisement also gives the Bovary Company an idea... what if they appeared in the commercial instead of the Averages?

Manson does things her own way, and when she plays the guitar, she does so, in a strange, deafening manner that shatters everything around her to pieces! Finally, she meets her match: a monster that turns everything into glace… and Matt intends to find out why!

The clocks seem to be going haywire in Joliville. And it just so happens that the Monster Agency is invited for a TV interview! Not easy to arrive on time... But that's not all: people also seem to be getting younger at an incredible rate... until they're becoming like babies! A monster is clearly having fun manipulating time...