ABSTRACT: In this article, I conduct a contextual analysis of transhumanist conceptions of posthuman futures. Focusing on cryonics, nanotechnology, and artificial superintelligence technological projects through a study of primarily American sources from the 1960s onward, I identify three distinct conceptualizations of the posthuman future: Promethean, spontaneous, and scalar. I argue that transhumanists envision posthumanity as resulting from a transition that involves both continuity and radical change. Although these three posthuman futures appear to share an interest in predicting a superior “cosmic” realization of human destiny, they involve distinct “liberal” conceptions of historical agency. These include the unlimited individual lib...