Existential Risk is a film about the possibility of human extinction or civilizational collapse, as these questions (and others) are grappled with in Cambridge, England. A personal documentary in which the filmmaker's own existential crisis (micro) is contrasted with planetary risk (macro).

The film features (in order of appearance): Martin Rees, David Cleevely, Shahar Avin, Huw Price, Heather Douglas, Hugh Hunt, Adrian Currie, Jane Heal, Stephen Cave, Toby Walsh, Alan Blackwell, Sean Holden, Lucy Cheke, Stephen Layton.