Klein gegen Groß – Das unglaubliche Duell is a family game show that has been broadcast on the first channel since 2011, on ORF 1 since March 2017 and on SRF 1 since November 2020. The format is produced by i&u TV. Kai Pflaume acts as host and moderator.

Lukas Maler is a butcher. Albeit more out of necessity than out of passion: As the “Karajan with the scalpel”, his vocation was always forensic medicine. When he accidently destroyed all evidence against the “24-hour-killer”, his career as a coroner was done for. And not far from it was his marriage with his great love Diana, whom he could not offer anything anymore as a broken man. But Lukas gets a second chance when once again a serial killer terrifies the city because the murders resemble those of the “24-hour-killer”. Diana – who has ascended to head of the forensic institute in the meantime – knows that only the best one can solve the case. But he is not available. And so, she gets the second-best one: the most over-qualified butcher in town…