Instinct (1999)6.6 /10

Storyline:  Anthropologist Dr. Ethan Powell, missing in Africa for nearly two years, is incarcerated in a Florida psychiatric facility following violent actions. Psychiatrist Dr. Theo Caulder assumes his case, finding Powell non-communicative after extensive time with gorillas. Gradually establishing connection, Caulder investigates the circumstances surrounding Powell's killing of poachers. Through their interactions, Powell challenges Caulder's worldview regarding human dominance and existence's fundamental nature, permanently altering the psychiatrist's philosophical perspective on civilization and consciousness.