The Unstoppable Yellow Yeti

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, jeopardizing 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, Gustav becomes his clueless ski instructor and Rita pits him against 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.

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.

When Gustav thinks his Grampapa has 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.

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 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.