Ickis, Krumm, and Oblina go on a scare in an abandoned building. They spot four gargoyles, monsters condemned to live out their days in cement for a crime they claim they did not commit. Ickis frees them from their prison, but soon has to run for his life when he discovers they are guilty of the crime.

The festival celebrates the shedding of skins that each monster must undergo as he or she moves from childhood to adolescence. As the festival approaches, Krumm is chosen to form a band and Oblina is chosen to perform the festival's ceremonial dance. Ickis, who shows no signs of shedding, feels left out.

Ickis gets "flashed" (gets his picture taken) by a celebrity reporter. If this picture runs on the front page, monsters' existence will be revealed to humans. Our heroes must band together and go above ground to retrieve every newspaper copy before dawn.

Feeling like Ickis and Oblina are not paying him enough attention, Krumm moves out of their dorm room and into the room of two other monsters - Snav and Blib. These two monsters spoil Krumm with attention, which he needs - at first. But soon Krumm realises that being the centre of attention is not all it's cracked up to be.

Krumm gets a bad case of the hiccups or in monster terms, ""the Nolox."" Every time he Noloxes, something terrible happens. It's up to Oblina and Ickis to find a cure for the dreaded Nolox.

A new carnival opens near town and The Gromble is insulted and outraged by one of its attractions - the ""Monsters Are Fun"" ride. He assigns his two top students, Oblina and Krumm, the task of scaring its riders and shutting down the attraction.

Ickis, Krumm and Oblina get trapped inside a nuclear power plant when they accidentally set off a warning device closing down the entire facility. Seeing the three monsters on a monitor, one of the plant workers mistakes them for three plant employees. A team of highly trained doctors don protective clothing and go inside the facility to bring the "employees" out to safety.

Oblina, always the star pupil, finds herself challenged to the limit by a gifted transfer student from another dump.

While getting ready to do a scare at a hypnotist's show, Ickis stares at the hypnotist's watch and inadvertently gets hypnotised along with the hypnotist's intended subject - a loud-mouthed Car Salesman. Oblina and Krumm are mystified that whenever the word "human" is uttered, Ickis begins to act like the Car Salesman.

Ickis discovers a remote control helicopter in the dump and uses it to scare humans from long distance. Zimbo hates the helicopter because he feels there's only room for one flying monster in the Academy. Soon he and the "Ickis Copter" get into a dogfight!

Ickis, Krumm, and Oblina are saddled with babysitting the Gromble's nephew, Bomble. They take him along on a garbage hunting trip to a local hospital where the baby monster is accidentally switched with a new-born human baby. The trio must track down the Bomble at the home of his new human ""parents"" and replace him with the human.

Through a series of misinterpretations, Krumm is convinced that Oblina has a crush on him. Krumm gets paranoid about what this will do to their friendship and tries desperately to avoid her.

Alone in the dump, Ickis dons a cape and pretends to be his favourite comic book hero, "Ultra-Monster". Suddenly, he is accidentally thrown through the air by a bulldozer and inadvertently saves a group of students. It's a bird, it's a plane...it's Ultra Monster! Word gets around the academy that "Ultra-Monster" is real and very cool. When Krumm volunteers to play sidekick, "Stink Boy", a new dynamic duo is born.

Ickis, Krumm, and Oblina sneak into Simon's house to scare him. After the scare, Simon seems to know the monsters' whereabouts. He shows up when they least expect it. How is he doing it?

When the Gromble dumps his obnoxious nephew on Ickis, Krumm, and Oblina, the only way they can find to keep him quiet is to tell him a story. Oblina treats the tyke to her own version of "The Three Billy Goats Gruff" where the Troll is the hero.

When a cocky Ickis takes a break from scaring to eat the grime of a dirty car, he inadvertently ends up in a car wash. Now covered with three coats of wax, the frictionless Ickis must slip and slide his way through an important scare. Luckily for him it's at an Ice skating rink! Ickis out "slips and slides" everyone.

In the course of giving Simon, the Monster hunter, a routine nightmare, Ickis gets sucked into Simon's brain. Ickis can see through Simon's eyes and discovers that he can control Simon's actions. Ickis takes Simon on a rampage through the city streets. Word spreads of this crazy man and he is finally detained by doctors. Oblina and Krumm must get Ickis out of Simon's brain before the cat scan reveals his existence.

The Monsters are foraging in the dump. Suddenly, bulldozers move in and begin pushing the garbage onto a huge barge where it heads off to sea with Oblina, Krumm and Ickis on board. At first it's party time, but soon, everyone wants to go home.

Ickis is in the middle of projecting a botched scare on the viewfinder when The Gromble sees something on the screen that makes him turn white as a sheet-- the red delivery van of Dick Jolly of "Jolly Rooter Sewer Service." Years earlier The Gromble tried to scare Jolly but was thwarted by Jolly's horrible "sewer eater" (the Roto-Rooter machine). The Gromble takes Ickis, Krumm and Oblina on a misguided search for Jolly.

Ickis, Krumm and Oblina go for a romp in the sewer, tossing one of Krumm's eyes around in a game of catch. The eye accidentally falls into the water and is swallowed by a boa constrictor. The snake leads the trio on a a wild chase. It eventually ends up at a rock concert, where they finally capture it, along with Krumm's eyes.

Simon the Monster Hunter builds the ultimate monster hunting machine; The Simon-Mobile, in an attempt to capture a real monster. When the monsters get wind of this, they build a machine entirely out of garbage and go head to head battle with Simon. With The Gromble at the helm, the monsters emerge victorious.

When a group of "cool" girl-monsters shuns the obsessively rule-bound Oblina, she transforms herself into Oblina The Rebel--breaking every rule she can.

Ickis and Krumm are debating over who's the ""most fearless"" monster. Oblina is sick of listening to Krumm and Ickis and dares them to sneak into Snorch's room while he's sleeping and pluck a golden hair out of his nose. When the Snorch awakes and notices his prized possession missing, he gets into a horrible mood. He takes it out on everyone in the Academy including his best friend, Zimbo. Zimbo takes it upon himself to find out ""who done it.""

While above the ground, a puppy saves Ickis from being run over. He sneaks the puppy back to the academy and enlists his friends' help to hide it from the Gromble.

The monsters are overjoyed when the famous Loch Ness Monster pays a visit to The Academy to give a guest lecture. Unfortunately, the rowdy, boisterous Scotsmonster gets on everyone's nerves by relentlessly singing Scottish songs, dancing and re-enacting his famous scares.