The Second World War has had a profound effect on recent history, how we understand Europe and what we consider necessary to build stable democratic societies. At a juncture in which the most important legacy of that conflict, the European Union, is being questioned and where nationalist populism is on the rise, it seems particularly important to look back and re-evaluate the global conflict in a new light. Indeed, the conflict left no European nation untouched. The Spanish case shows how the war had a serious impact not only on the belligerent nations but also neutral and non-belligerent ones. This special section aims to explore the dynamics of relations between Francoist Spain and Nazi Germany during the Second World War, and in doing so contribute to a better understanding of the conflict. The analyses brought together in these pages aim to place Francoist Spain in the broader context of the global conflict, focusing particularly on the transnational contacts between fascist and para-fascist movements, 1 Spain's engagement with the Nazi-fascist European project and the role of neutral countries in the midst of total war. Rather than focusing excessively on Spain's potential entry into the Second World War, the different contributions look more broadly at Spanish-German relations in this period. Such a viewpoint illuminates not only the role Spain had within Nazi foreign policy or the inner workings of Francoism and Nazism, but also key themes in the field of European history.