This article explores how issues of ‘not quite human-ness’ expose the conditions of possibility of being considered human; of human ontology. I refer to these dynamics for identifying sameness and difference as ontological politics of recognition. Tracing the genealogies of passing, I situate passing and Othering socio-political regulation and ideological frameworks for conceptualising ontology. I am particularly concerned with how the notion of ontology is bound up in questions of race and gender, and with the entanglements of technology and biology that can destabilise apparently fixed boundaries between the (natural/normative) human and its (constructed/abnormal) Others. I identify three trajectories of passing as human in the histories of science fiction. The first trajectory discusses ontological mimicry: the ways in which the non-human attempts to be like the human. The second trajectory addresses how passing as human relies on a Butlerian performativity: doing human-ness by complying with the regulatory frames for appearances and practices. The final trajectory discusses what is at stake in contemporary ontological politics of recognition: a renegotiation of human supremacy through an emphasis on collectivity and collaboration rather that singularity and boundedness.