The squirrel brothers are going on holiday and suggest that the Megas put their toys away while they are away. Each Mega chooses a different toy, but to everyone’s surprise, Pickle prefers the cardboard box. The Megas think he’s chosen the worst toy of them all; that is if you can call it a toy! But, slowly, Pickle will find lots of different things he can do with the box just using his imagination: it will become a magic box or a puppet theatre or an original swimming pool. When their parents arrive to pick them up from school, they all ask them for a cardboard box for their birthdays.