Season 1 ZDFneo , 2013 Season 2 ZDFneo , 2014 Season 3 ZDFneo , 2014 Season 4 ZDFneo , 2015 Season 5 ZDF , 2015 Season 6 ZDF , 2015 - 2016 Season 7 ZDF , 2016 - 2017 Season 8 ZDF , 2017 - 2020