His biggest TV-part up to that point was his role in the 2008 crime movie Pfarrer Braun – Heiliger Birnbaum, aside to Ottfried Fischer. After that Mölleken played opposite Ludwig Trepte in the TV-drama Ihr könnt euch niemals sicher sein, which was awarded among others with the Austrian television award Romy and the Grimme-Preis in 2009.