On screen
Cast
19 credited performers
Anthony Wong Chau-Sang
Alan Tam
Artwork unavailable
Dolphin Chan Hoi-Hang
Dolphin / Shark
Parkman Wong Pak-Man
Officer Lee Sau
Lawrence Ng
Wong Yu Yan, Anthropologist
Teddy Yip Wing-Cho
Dolphin's Dad
Dayo Wong Chi-Wah
Dr. Wong
Perrie Lai Hoi-San
Whale
Lee Chung-Wai
Character not listed
Lau Ching-Wan
Joe [cameo]
Chang Gan-Wing
Library Cleaner [cameo]
Herman Yau
Character not listed
Bobby Yip Kin-Sang
Character not listed
Artwork unavailable
Wong Lap-Wai
Character not listed
Lee Man-Piu
Character not listed
Quinton Wong Liu-Che
Character not listed
Benny Lam Diy-Kuen
Character not listed
Hau Woon-Ling
Character not listed
Tony Leung Hung-Wah
Character not listed
Yu Miu-Lin
Character not listed