纽约中央公园车站处，一个戴着墨镜的男人凭空出现，他自称自己来自一个距离地球一千光年之外的K星，名叫普洛特，他此次来地球是为了考察。普洛特的一番言论惊世骇俗，他怪异的举动招来警方，警方认为他有妄想症。普洛特随即被送进曼哈顿精神病院，马克医生负责对他进行治疗。马克虽然诊断普洛特是妄想症病患，但普洛特匪夷所思的行为和条理清晰的天文知识表述让马克有些怀疑自己对普洛特的诊断。普洛特在病人中高谈阔论，他在病人中做了三个实验，实验结果根本就是只有外星人才能实现。所有病人都相信他确实是外星人，他们都希望被普洛特选中跟他一起回K星，因为普洛特说过他会在某一天回去，还答应会带一个人走。普洛特的影响力让马克医生吃惊，他希望查出普洛特的真实身份但一无所获。转眼到了普洛特要回星球的那天，天空一道亮光闪过，普洛特消失了，跟他一起消失的还有一个精神病人

At Central Park Station in New York, a man wearing sunglasses appeared out of thin air. He claimed that he came from a K star a thousand light-years away from the earth , named Plott, he came to Earth this time for investigation. Plott's remarks shocked the world, and his weird behavior attracted the police, who thought he was delusional. Plott was then sent to the Manhattan Mental Hospital, where Dr. Mark was responsible for treating him. Although Mark diagnosed Plott as a delusional patient, Plott's unbelievable behavior and clear expression of astronomical knowledge made Mark doubt his diagnosis of Plott. Plott talked loudly among the patients. He did three experiments among the patients. The results of the experiments were simply that only aliens could achieve it. All the patients believed that he was indeed an alien, and they all hoped to be selected by Plott to go back to Planet K with him, because Plott said that he would go back one day and promised to take someone away. Dr. Mark was surprised by Plott's influence. He hoped to find out Plott's true identity but found nothing. In a blink of an eye, the day when Plott was going back to the planet, a bright light flashed in the sky, Plott disappeared, and a mental patient disappeared with him