The aim of this article is to analyse the TV series Black Sun/Shadows over the Balkans (Senke nad Balkanom, 2017, Dragan Bjelogrlić), understood as a reflection of the ways in which diverse imperial legacies, persisting differences and contrasting pasts shaped the (ambivalent) post-imperial traumatic history of the newly formed Kingdom of Serbs, Croats and Slovenes in 1918. The burden of imperial legacy – mostly manifested in ethnic, political, cultural and economic tensions among diverse nations in the new multi-ethnic state – kept brewing under the surface and came to represent a constant threat of balkanization i.e. further fragmentation of the multicultural kingdom. In this article I claim that the same danger of balkanization – traced back to the years after the Great War – continued to haunt all successor states of the Kingdom of Yugoslavia (and Yugoslavias ensuing from 1943 until 1992) eventually resulting in the break-up of the Socialist Federal Republic of Yugoslavia (SFRY) in 1992. The irreconcilable differences and competing ambitions of different national, social and geopolitical identities define the structure, characters and their relations in the TV narrative, and are also reflected in the cityscape of Belgrade – the capital of the Kingdom and paradigmatic Balkan metropolis – in the late 1920s. The series is read against the theories of Dominique Moisi’s Geopolitics of Emotions (2010) and La géopolitique des séries/Geopolitics of TV Series (2016), and his assertion that TV series have become crucial in understanding our world in its many aspects – from domestic politics to geopolitics. The story of Belgrade between the two World Wars reveals the traumatic imperial legacy as determining the emergence of a ‘culture of fear, hope and humiliation’, tensions of balkanization and search for identity in the city suspended between an Ottoman casaba and a European metropolis. On the other side – in terms of narrative, genre, and visual style – the series itself is seen as the acculturated version of both the novel Der nasse Fisch (Volker Kutscher, 2007) and the TV series Babylon Berlin (2017), illustrating the rise of cultural imperialism in post-imperial times.