- Stephen Fung
- H20
- Ken Chang
- Harry / Sammy
- Angelica Lee
- Katy Lam
- Eileen Tung
- Supt. Margarita So
- Ken Wong
- Sunny
- Andrew Lien
- Terrorist leader
- Chi Kui Chow
- Jason
- Law Man Tong
- Landon Fu
- Yam Chan
- Mr. Fu Hang
- Gei Shun Wai
- Asst. Commissioner
- Simon Lui
- William Hung
- Spencer Lam
- H20's father
- Man-No Chen
- H20's mother
- Astrid Chi Ching Chan
- Sammy's sister
- Mary Hon
- Sammy's mother
- Shan Lo
- Sammy's dad
- Phillip Chung-Fung Kwok
- Action choreographer for TV
- Kin-Wing Chan
- H20's friend
- Joan Lai-Kau Tong
- Snr Police Officer
- Raymond Ho-Yin Wong
- Elite fireman
- Sammul Chan
- Elite policeman
- Po Chun Chan
- Police Public Relation Officer
- Suet Lam
- Wise guy
- Wai-Fai Wong
- Katy's bodyguard
- Man Ki Kwok
- Reporter
- Wing-Wai Chin
- CD shop boss
- Man Sze Au
- Student
- Yee-Ha Au
- Girl jumper
- Loi-Kwan Kam
- Terrorist
- Kaki Leung
- Student
- Wai-Kuen Lok
- C.I.D.
- Cho-Lam Wong
- Student
- Kwan-Hong Wong
- Mad man at kindergarten
- Will Wong
- Student
- Max Yip
- SDU
