IR scholars increasingly turn to the writings of Existentialists to make sense of the multiple and entangled planetary crises that characterise the twenty-first century. In this article, I argue that two postwar intellectuals, Günther Anders (1902–1992) and J. G. Ballard (1930–2009), offer a rich intellectual ancestry and inspiration to such scholarship. Both authors critically and creatively reworked central Existentialist ideas in the context of postwar technological acceleration and the development of nuclear weapons. To Anders and Ballard, nuclear weapons symbolised, and were the most extreme manifestation of, the pathologies they associated with technological modernity: mass consumption, spectacular violence, a deadening of affect, and an increased inability of humans to psychologically process and grasp the destructive capacities of science and technology. To counter these trends, they both firmly relied on Surrealism to bolster the human imagination as a catalysator for personal and social transformation. I argue that their work offers an opportunity to reconnect the study of nuclear weapons in IR to broader existentialist questions and suggest that their respective attempts to foreground human being in the nuclear age as ‘being-towards-extinction’ holds important lessons for recent attempts to recentre the study of IR around planetary imaginaries of extinction.