Krumm sprouts a gigantic pimple. The pimple has its own personality and is a hit with the other monsters, putting the squeeze on Krumm's popularity.

Every boy and monster's worst fear is realised for the Gromble -- his mom shows up at the academy unannounced. The Gromble leaves her in the care of Ickis, Oblina, and Krumm for the afternoon with alarming results.

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.

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.

When Krumm loses his pit hairs as the result of a "Monster Mischief Day" prank, Ickis vows to do anything to get him his hair back. Ickis finds a stash of discarded "Super Grow" hair tonic in the dump and rubs it in Krumm's pits--to disastrous results.

The Gromble is up of his job review at the hands of Balook The Granfaloon, a puny, "by the book" Bureaucrat, who fires The Gromble for breaking a trivial rule against students celebrating after a scare.

A case of mistaken identity leaves Ickis thinking six lobsters are actually six monsters. He saves them from being served as dinners and promises to see them safely home.

When Ickis gets stuck in a toilet in Rock Star Suede's house, the monsters' only hope is to disguise Ickis in Suede's coat and hat and try to walk home. The trip home turns into a disaster as the monsters get tossed out of a taxi, cause a massive pileup and are chased back to the dump by TV Reporter, Exposia Vertov, and a horde of screaming teeny boppers, who think the disguised Ickis is Suede.

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.

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.

The Academy shuts down when a human spy is discovered inside. From Ickis' hiding place, he realises he has dropped a drawing of The Gromble in the hallway. The spy picks it up and accidentally drops his own secret document. Ickis, Krumm and Oblina use the paper to track down spy headquarters and arrange for a transfer of the documents.

Ickis is perpetually late for class, so The Gromble hangs a big clock around his neck to remind him to be on time. When Ickis rewinds the hands on the clock, he discovers that he can turn back time.

The Academy is gearing up for the Scaring Olympics. The Gromble wants desperately to win the competition and is pushing his students to do their best. Unfortunately, Krumm has swallowed an Indian feather that is tickling him on the inside.