Drawing on a deep and varied archive of materials—early sexological texts, fugitive slave narratives, Afro-modernist literature, sensationalist journalism, Hollywood films—Snorton attends to how slavery and the production of racialized gender provided the foundations for an understanding of gender as mutable. In tracing the twinned genealogies of blackness and transness, Snorton follows multiple trajectories, from the medical experiments conducted on enslaved black women by J. Marion Sims, the “father of American gynecology,” to the negation of blackness that makes transnormativity possible. Revealing instances of personal sovereignty among blacks living in the antebellum North that were mapped in terms of “cross dressing” and canonical black literary works that express black men’s access to the “female within,” concludes with a reading of the fate of Phillip DeVine, who was murdered alongside Brandon Teena in 1993, a fact omitted from the film out of narrative convenience. Reconstructing these theoretical and historical trajectories furthers our imaginative capacities to conceive more livable black and trans worlds.