A Friend from Inner Space

Ti Lung

Joe Weng

Josephine Siao

Mrs Maggie Weng

Shih Kien

Jian Ren (ghost)

Leung Jun-Git

Weng Xiao Ji

Natalis Chan Pak-cheung

Principal Apple

Wong Wan-Sze

Joe's sister / Ah Zhen

Rainbow Ching

Joe's girlfriend from America

Walter Tso Tat-Wah

Detective

Manfred Wong Man-chun

Joe's friend at pub

Chan Chuen

Taxi driver

Elaine Jin Yan-Ling

Jenny

Leung Hak-Shun

Chan Hung

School cleaning lady

Bonnie Wong Man-Wai