This article introduces the Special Issue 'Mobilising Global Citizenship Education for Alternative Futures in Challenging Times'. Our call for papers was inspired by the 10th anniversary of a 2011 special issue on the political economy of global citizenship education (GCE) edited by Vanessa Andreotti. In this introduction, we review the main aims of this follow-up collection, noting the proliferation of scholarship on the topic of GCE and calls for more critical engagements. We outline the key provocations of the call for papers and review the contributions, setting out an overview of the landscape of the SI through intersecting themes, concerns, and possibilities. The articles in this collection demonstrate ongoing concerns around neoliberalism and how GCE is always implicated in the inequalities it aims to address. They also highlight emerging possibilities and further questions in response to current conditions. This collection contributes and maps new edges of debate within critical approaches, provides practical insights into reflexive approaches in situ, and sheds light on common and specific issues and possibilities across regions and across formal and nonformal educational contexts. We end the introduction by highlighting the contribution from Vanessa Andreotti that concludes the collection and articulates a 'passing of the torch' to those entering and continuing work in this dynamic field.