From the first day of his life, Mungus Bigfoot has been the perfect monster.

He's won prizes, passed tests and impressed his family, his friends and his teachers with his bad behaviour.

Scary, smelly, food-flinging and rude, Fred is the natural choice to help Emily Twinkletoes, the worst young monster around.

She's failing miserably at being horrible and can't scare anyone.

It's up to Fred to make sure she learns how to behave like a proper monster - but she teaches him a lesson instead!