The Junior detective series TKKG is a German series of audio dramas and novels created by "Stefan Wolf", a pseudonym used by Rolf Kalmuczak.
In all German-speaking countries they are the most commercially successful series of novels of their type, apart from The Three Investigators. They call themselves TKKG, after the initials of their names: Tarzan (later renamed in Tim, because "Tarzan" is a trademark), Karl, Dumpling (in German Klößchen, in Austria called "Klumpling") and Gab(b)y; an unofficial fifth member is Gaby's Cocker Spaniel, called Oskar. Since 1979 they continually solve all sorts of crimes, from thefts and robberies to kidnappings and terrorism.
The books were written by Rolf Kalmuczak, under his nom de plume Stefan Wolf. In June 2004 TKKG changed their publisher from Pelican to CBJ - They published volumes 07, 14, 54, 77 and 84 in January 2005 as a new edition with the CBJ brand name.
Peter Timotheus Carsten, which is his full name (just called Tim, which is short for Timotheus, after Tarzan had to be replaced) is the leader of the TKKG gang, who are named after the initial letters of their names or nicknames. Tim is 14, but mentally and physically far ahead. A tanned athlete, he particularly enjoys judo (he has a brown belt) and volleyball. For two years (at the beginning of the series) he's been living in a famous boarding school, and is pupil of class 9b. His father, an engineer, had a fatal accident when Tim was only 6 years old. Tim's mother, a book-keeper, works hard to earn enough money for the expensive school money for their son. Tim loves adventure and hates injustice, and has a big crush on Gabby, of whom he is very protective.
Oskar is a 1962 Danish film directed by Gabriel Axel and starring William Bewer.
750 Oskar is a minor planet orbiting the Sun that was discovered by Johann Palisa on April 28, 1913 in Vienna. Photometric observations made in 2012 at the Organ Mesa Observatory in Las Cruces, New Mexico produced a light curve with a period of 6.2584 ± 0.0002 hours and a brightness variation of 0.21 ± 0.02 in magnitude. This is a member of the Nysa family of asteroids that share similar orbital elements.