Paul B. Preciado, a trans philosopher and writer, delivered this address to 3,500 psychoanalysts at their international conference in Paris, speaking as what he calls 'a monster' to an institution built on the pathologization of gender nonconformity. Preciado argues that psychoanalysis inherits colonial-era ideologies of sexual difference that it mistakes for universal truths. The discipline's founding assumption--that anatomical sex determines psychic identity--cannot account for trans experience except as pathology. Preciado speaks from personal history: assigned female at birth, he underwent analysis during transition and experienced how psychoanalytic categories constrain rather than liberate. The lecture calls for psychoanalysis to undergo its own transformation, abandoning binary frameworks that emerged from a particular historical moment and recognizing gender as multiple, mutable, and irreducible to anatomy. Preciado writes in an intensely personal register, combining theoretical argument with bodily experience. The book includes responses to the lecture, documenting how analysts received this challenge to their discipline. Preciado's work participates in broader debates about trans identity, medical authority, and the politics of diagnosis. Whether readers find his arguments persuasive, the lecture demonstrates how trans perspectives expose assumptions that remain invisible to those they do not constrain. The book is both polemic and provocation, inviting transformation rather than merely critique.