This book re-evaluates the role of performance in global politics in the face of populism and the digital mediatisation of political interactions. As political communications are increasingly conducted in online environments,'post-truth' performances become evermore central to democratic processes. It is therefore essential to reconsider the political potency of performance and theatricality in order to effectively reinvigorate democracy in the 21st century. Drawing on applied theatre practices, this book shows that performance is inherently concerned with cooperative and collaborative encounters across difference, and performance might therefore support effective responses to digital populism. The analysis addresses the performative aspects of populist political movements in the United States and United Kingdom. The chapters engage with aspects of performance and theatricality not commonly broached in IR scholarship, including interpersonal engagement, creative embodiment and interactive affect, making the case for the importance of these features to democratic engagement. This book resonates with recent debates regarding the relevance and treatment of Arts and Performance as IR subjects, methodologies and practices, and will be of interest to scholars and students of global politics, international relations, performance studies, radical democracy, and mass communication and culture.