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Osmo's arrival gets stranger when he befriends a yellow yeti called Gustav. His amateur monsterologist cousin Rita suspects a monster is afoot, which is against Winterton rules.
Osmo and Rita's first family dinner goes badly, jeopardising Osmo's stay in Winterton. Gustav must save the day in a clever chef disguise, right under Mayor Chrome's nose.
When Osmo has to get a skiing license or be banished, becomes his clueless ski instructor and Rita pits him Mayor Chrome in a downhill race to stay in Winterton.
When monster panic strikes Winterton, Gustav volunteers as a stand-in yeti for Mayor Chrome's monster-preparedness drills, but struggles to be convincingly scary.
When Gustav thinks his Grampapa has been turned into Chrome's new rug, the kids help give him a send-off at Monster Graveyard. But Osmo must first conquer his fears.
When Osmo's inflatable doughnut goes missing with everyone's mail, the trio search for Winterton's Mail Cats, who have gone feral. The Northern Lights offer help, for a sacrifice.
When Ned thinks Osmo needs company, he gets him a cute pet which turns out to be a vicious monster. Osmo and Gustav must get rid of it before it destroys Winterton.
Rita finds proof that her hero, Emma Erton, was the true founder of Winterton, but loses it to Anders and his cronies. Osmo and Gustav must help her fight for it back.
When Osmo and Rita suspect Gustav is going 'full monster', they trap him so they can find a cure, only to get symptoms themselves. Now Gustav must figure out how to cure them.
A lake monster cozies up to Gustav in the belief that he wants to take her out for dinner, with Osmo and Rita as the main course.
When Osmo's eagerness to fit in by celebrating Winterton's founding leads to disaster, he must use his wits as an outsider to save the town with Gustav and Rita's help.
When Gustav plucks a legendary plunger from the town toilet, he thinks he's Winterton's one true plumber, leaving Ned bummed. Osmo and pals must help him get his confidence back.
When Osmo signs Winterton up to host the Winter Games, Chrome is caught unprepared. The trio must rally the town to put on a big show for the demanding Chairman.
When Osmo discovers a monster who looks just like him, he teaches him how to have fun, only for his clone to cause chaos all over town. Now the trio must tame the terrible twin.
When Rita competes with Osmo and Gustav against Anders' crew in a sauna competition, her competitive side emerges. Osmo and Gustav must get her to cool it before she blows her top.
When Spring doesn't come, the townsfolk begin acting strangely. It's up to Gustav to perform various ridiculous deeds before the Northern Lights will bring on Spring.
When Rita takes her mom's secret amulet, the trio experience bad luck and suspect that Lydia may be a monster. They must make amends to break the curse.
When Osmo, Rita, and Gustav get trapped in a gondola, their friendship is tested by panic and paranoia, while Chrome and Ned bicker over how to get them back down to Earth.
The trio's scheme to bring online delivery to Winterton is a huge success, but when they drive Mr. Cavity's shop out of business, they must remind everyone of his old school charm.
When Gustav is mistaken for a giant teddy yeti by Anders' spoiled little sister, Osmo must break him out of their house, even if he has to play friends with Anders.
