Prot is a fictional character from the 1999 film "K-PAX," portrayed by actor Kevin Spacey. He claims to be an extraterrestrial from the planet K-PAX and arrives on Earth, where he is admitted to a psychiatric hospital. Throughout the film, Prot shares insights about life and human behavior, challenging the perceptions of those around him. The story explores themes of mental health, reality, and the nature of existence. As Prot interacts with the hospital staff and patients, he raises questions about what it means to be human, ultimately leaving a lasting impact on their lives and perspectives.