A large blast hits the gas pipeline in the industrial park due to a sudden earthquake, which triggers massive explosions and engulfs the neighboring area in flames. Facing the escalating fire danger, the Fire and Rescue Force quickly reaches the hazardous zone to hold the fire and cut a firebreak, in the meantime, many survivors are pulled out of the rubble.
Sunny is a naïve circus performer who dreams of inheriting his father's knife-throwing skills. However, his hostile colleagues continue to bully him, relegating him to a lowly clown. On a tour to Malaysia, Cheung and other performers discover a cave occupied by the Japanese army during World War II. Instead of finding treasure, the performers - including Sunny - are sprayed with a mysterious chemical that turns them into superhuman mutants...
