The Wesley's Mysterious File (衛斯理藍血人) is a 2002 Hong Kong action science fiction film directed by Andrew Lau starring Andy Lau, Rosamund Kwan and Shu Qi. Hong Kong director Wong Jing also makes a cameo appearance. The film is an adaptation of a novel by Ni Kuang.

Plot

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.