ABSTRACT This introductory essay surveys a wave of mass movements in contemporary East and Southeast Asia. We identify three main aspects that drove and sustained this wave of societal pushback amidst institutional decay. We first discuss how democratic backsliding shapes the spread of mass mobilization in polities that are seen as regulated by the interest of power elites and their machinery of coercion and adaptation. We then critically examine the continued relevance of protest leadership by highlighting the relational dynamics between organizing with and without (formal) organizations. We further examine how network and coalition building in political and civil societies shaped the long-term trajectory of movement organizations to facilitate large-scale protests at critical times. This review draws on the contributions to this special issue and the recent literature on democratic backsliding and political activism. It provides a holistic survey of defensive mobilizations and the interactive mechanisms among the masses in the region and beyond.