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...

Aaron Kwok Fu-Shing
as Sunny Li Fei

Shu Qi
as Angel Chan

Wu Jing
as Sun Hao

Zhang Jingchu
as Cheng Xiuhua

Yuen Wah
as Uncle Da / Tak

Collin Chou
as Zhang Dachu

Tie Nan
as Liu Zhenxing

Karen Cheung Bo-Man
as Yao Li

Gao Yan-Chao
as He Jun

So Ming-Hei
as Zhang Tiegen