The film tells the story of Wesley who works in San Francisco for a UN department investigating extra terrestrial sightings. When Fong an alien from the Dark Blue Planet arrives in town seeking the remains of her brother, Wesley; Fong and two agents from a secret FBI alien department become entangled in a conspiracy involving the government departments and two different alien species.

• Andy Lau as Wesley
• Rosamund Kwan as Fong Tin-ai
• Shu Qi as Pak Sue
• Wong Jing as Dr. Kwok
• Mark Cheng as Kill
• Almen Wong as Rape
• Roy Cheung as Pak Kei-wai
• Samuel Pang as Tan
• Patrick Lung as Mr. Chu
• Yo Yo Fong as Ling-ling
• Thomas Hudak as Wilson
• Beverly Hotsprings
• Tré Shine
• Vincent Zhao

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• Girls with guns
• Wisely Series, the novel series by Ni Kuang
• Films and television series adapted from the Wisely Series:
  • The Seventh Curse, a 1986 Hong Kong film starring Chow Yun-fat as Wisely
  • The Legend of Wisely, a 1987 Hong Kong film starring Sam Hui as Wisely
  • The Cat (1992 film), a 1992 Hong Kong film starring Waise Lee as Wisely
  • The New Adventures of Wisely, a 1998 Singaporean television series starring Michael Tao as Wisely
  • The 'W' Files, a 2003 Hong Kong television series starring Gallen Lo as Wisely

• The Wesley's Mysterious File at IMDb