Andy Lau (The Duel), Shu Qi (Martial Angels), and Rosamund Kwan (Once Upon A Time In China) star in this big budget, special effects, laden sci-fi action adventure, based on a best-selling science fiction novel. Wesley (Andy Lau) is a memeber of the United Nation Aliens Analyzing Agency, and no stranger to extraterrestrial sightings. This time he finds himself face to face with Fong (Rosamund Kwan), a blue-blooded alien stranded on earth. Wesley and his girlfriend So (Shu Qi) promise to help Fong, but they must first combat FBI's powerful X Unit, who intends to capture Fong for their experiments. Making matters worse is the arrival of two aliens from Fong's home planet, determined to kill anyone that prevents them from retrieving their own species.