After a sports session at school, Gabriel goes to class without showering or changing his tshirt. The girls notice that Gabriel smells. He's embarrassed, but Tony insists it must mean that he's becoming a man. Gabriel thinks he's beaten the smell by spraying on some air freshener but he soon realises the smell has returned. Everywhere he goes, a green B.O monster follows him, and it's making his life miserable. The girls refuse to hang out with him. The smell is just too gross. Tony and Gabriel seek advice from Max - after all, the girls fall at his feet - and with his guidance, Gabriel defeats the B.O monster once and for all. It's just a shame that Tony then becomes a different kind of smelly monster.