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, 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.