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…

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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…

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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…

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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…

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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!

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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.