The hit TV series "Babylon Berlin" has captivated audiences by portraying the chaos and excitement of Weimar-era Germany, but the dark shadow of Adolf Hitler's rise to power will bring down the curtain on the show's upcoming final season.

Season 5 will debut online in Germany at a time when many are fretting about the rise of the far-right Alternative for Germany (AfD) party, which scored a breakthrough victory in a state election last Sunday.

The timing is "pure coincidence," insisted the directors behind the programme, Tom Tykwer, Achim von Borries and Henk Handloegten.

But viewers and critics are still certain to draw uncomfortable parallels and resonances in the gritty hit drama from public broadcaster ARD.

Inspired by crime novels from German author Volker Kutscher, the big-budget series is set against the backdrop of the final years of the Weimar Republic, Germany's 14-year experiment in democracy.

The era, sandwiched between the end of World War I and Hitler's ascent, was a period of liberal social attitudes, rapid technological progress and cultural achievement.

But it was also a time of economic hardship, inflation and deep political polarisation worsened by the humiliation of military defeat and the Great Depression.

Broadcast in 140 countries, the show chronicles the investigations and romances in Berlin of Gereon Rath -- a young police inspector from Cologne traumatised by World War I -- and his partner Charlotte Ritter, a young Berliner from a modest background who dreams of a career in law enforcement.

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