The internalized perpetrator stands among the most clinically consequential constructs in depth-psychological and trauma literature. Across the corpus, the figure designates the psychic installation of an abuser’s voice, gaze, beliefs, and coercive logic within the victim’s own inner life — a process precipitated not by identification in any simple sense but by the structural conditions of captivity, dependency, and prolonged subjugation. Judith Lewis Herman provides the foundational articulation: the perpetrator becomes the most powerful person in the victim’s relational world, and the psychology of the victim is literally shaped by the actions and beliefs of the perpetrator, so that after liberation the enforced relationship continues to engross the victim’s attention as an inner presence. Herman traces its sequelae — chronic self-blame, shame, the sense that the perpetrator is still present — as diagnostic markers of complex trauma. Kalsched approaches cognate territory through the lens of archetypal defense, where an internal persecutory agency mirrors the external aggressor. Najavits and Shapiro address the clinical problem therapeutically: the perpetrator’s internalized ideology must be identified, disputed, and metabolized. Hillman, by contrast, interrogates the parental-fallacy reductionism of Alice Miller, cautioning that collapsing perpetration into an introjected father image forecloses archetypal and daimonic dimensions of evil. The term thus marks a contested frontier between relational trauma theory, object-relations internalization, and depth-psychological accounts of possession by autonomous destructive complexes.