Clumsy peculiar pupil Alfons Zitterbacke dreams of being an astronaut and wreaks havoc anywhere he goes but against all odds wants to proof everyone who is teasing him wrong especially his father who wants him to be more of a 'normal' kid.

After oversleeping yet again, Alfons manages to catch the bus to his class trip to the Baltic Sea at the last minute. In his luggage: lots of adventure, funny pranks and - wait a minute - his mother's clothes?