The film is a milestone for Hong Kong cinema, featuring over 1,700 visual effects shots. Louis Koo’s production company, One Cool Film Production , spent several years on post-production to ensure the CGI met international standards.

While the visual effects and action sequences were widely praised as "world-class," some critics noted that the screenplay followed traditional genre tropes and lacked deep character development.

A military task force is dispatched to deliver a gene virus to Pandora to neutralize its destructive growth while keeping its air-purification properties. The mission is complicated by high-tech treachery and the discovery of a conspiracy within the military's own ranks.

Set in the year 2055, the world is ravaged by pollution and global warming. A meteor crashes into Hong Kong (now known as B-16), bringing with it a giant alien plant named . While the plant purifies the toxic atmosphere, it grows uncontrollably during rain, destroying everything in its path.