黃秋生

Alan Tam

Dolphin Chan Hoi-Hang

Dolphin / Shark

黄柏文

Officer Lee Sau

吳啟華

Wong Yu Yan, Anthropologist

叶荣祖

Dolphin's Dad

黃子華

Dr. Wong

Perrie Lai Hoi-San

Whale

Lee Chung-Wai

劉青雲

Joe [cameo]

曾近榮

Library Cleaner [cameo]

邱禮濤

八兩金

Wong Lap-Wai

Lee Man-Piu

Quinton Wong Liu-Che

林道權

侯煥玲

Tony Leung Hung-Wah