For two years (at the beginning of the series) he's been living in a famous boarding school, and is pupil of class 9b.
Tim loves adventure and hates injustice, and has a big crush on Gabby, of whom he is very protective.
The smartest of the quartet, Karl Vierstein is sometimes nicknamed Computer because he has an eidetic memory; whatever he's read he never forgets - perhaps because his father is a professor for Maths at the local university.
Klößchen is called Klumpling in Australian audio book editions and in the official English translation of the movies.
His parents are rich - his father owns a chocolate ware company - but Willi likes to spend more time with his friends.
She is the daughter of police commissioner Emil Glockner and his wife Margot, who runs a small grocery store.
Like Karl, she lives with her parents in town and attends Tim's boarding school only for lessons.
While there are speculations amongst fans that the town is actually Munich, mostly due to the usage of typical southern german vocabulary in the series as well as the "towns of millions" being stated to be the capital city of a german state, Kalmuczak frequently dismissed these as false, claiming that the similarities were purely coincidental.
The series has appeared since 1981 with the radio play label Europa 231 audio books were recorded and released (since 1981).
In the main roles, Fabian Harloff started from episode 7 as Tim, Christian Pfaff as Karl, Kai Maahs as Doughnut and Jessica Gast as Gaby.
Movies in Cinema 1987–1989 appeared in Ehapa publishing house of 17 booklets with TKKG Comics (expenditure 1-2/1987, 1-12/1988 and 1-3/1989).
The Comics was produced by the studio Comicon, a draughtsman was Josep Marti, who also among other things for YPS drew.