Billy's off to a birthday party. He can't wait! And neither can his mini monsters...they've sneaked into the party too. Soon Gloop's in the gelatin, Trumpet's on a balloon and Fang-Face is about to become a birthday surprise...

It is holiday time for Billy and his Mini Monsters. There are just two small problems - Peep's been seen by the airport guards and Trumpet and Gloop have got lost with the luggage. Can Billy get his Mini Monsters back in time for take-off?

"Billy is dreading the school camping trip. His worst fear is having to go to the toilet in the dark. What if are bears? Or werewolves? The Mini Monsters promise they'll come and look out for Billy. But will they help? Or will they only make things worse?" -- Back cover.

Billy's moving house! But the Mini Monsters have got lost on the way. How will Billy ever find them again? And to add to the confusion, it turns out there's a NEW monster on the scene ...

Billy is feeling nervous about his FIRST EVER school trip, so the Mini Monsters decide to come along too. They promise not to be any trouble...but who's causing a commotion in the creepy-crawly room? Why does the T. rex skeleton keep roaring? And Billy can't help wondering about the really tiny Egyptian mummies... Can he save the trip from disaster?

Billy is trying to stay awake so the SCARY creatures of the dark won't come. But then he hears a squeaky little voice and notices some tiny purple footprints. Not only that, SOMETHING has ATTACKED his cheese sandwich. What could it be? Does Billy dare find out?

The mini-monsters cause chaos at Christmas. Can they work together to tidy up? It's nearly Christmas and Billy and Ruby are feeling very excited. Billy has asked Santa to bring presents for his Mini Monsters and they're very excited too, until they try to help with the decorating and bring down the entire Christmas tree. Now the baubles are broken, the fairy is squashed and Billy's mother is feeling sad. Can the Mini Monsters make Christmas right...