Double Vision (Chinese: 雙瞳; pinyin: Shuang tong) is a 2002 mystery horror film directed by Chen Kuo-fu.

The plot is about an FBI agent working with a troubled Taiwanese cop to hunt for a serial killer who is embedding a mysterious black fungus in the brains of the victims.

[3] Police detective Huang Huo-tu, a Waisheng ren (Mainland Chinese) in Taiwan, has relegated himself to a mundane job as a Foreign Affairs Officer as self-punishment for blowing the whistle on corruption in the force, and his colleagues have turned their backs on him.

A series of bizarre deaths in Taipei baffle local investigators, including a Christian preacher of foreign nationality found disemboweled.

Kevin, the topmost serial killer expert in the field, was previously investigating a series of murders in US in which all victims appeared willing to die.

After consulting a scholar in Academia Sinica, Huang and Kevin find that the killings follows a form of Taoist belief that one must fulfill five types of suffering required to become a Xian, an immortal being.

The scholar tells them that there is a legend of a person who had double pupils, he used his ability to send these sinners to hell, and subsequently acquired immortality through his actions.

After the massacre Kevin and Huang finds a seemingly innocent girl hidden inside a chamber at the back of the temple.

It is revealed that the girl is the actual cult's leader who has the double pupils in her eye and believes that by having Huang kill her, she can complete the final and last requirement to become immortal.