
In Hong Kong, Circa 1940s, World War II, private detective Yoyo and friend Inspector Teddy Robin join a resistance group during the Japanese occupation. They aim to steal back the formula to the atomic bomb from a war traitor and transfer it to an American before the formula ends up in the Japanese emperor's hands.

George Lam Tsz-Cheung
Yoyo

Teddy Robin
Inspector Teddy Robin

Brigitte Lin
Bridget

Paul Chun Pui
Fat Chicken - Commissioner of Police

Brenda Lo Yip-Mei
Dumplings

Tsui Hark
Japanese Ambassador

Anders Nelsson
The American

Joe Junior
Sam/Joe

Kit-wah Leung
Yoyo's secretary

Yip Ha-Lei
Fixes Yoyo's telephone
Tam Tin-Nam
Eating soup at the Hong Kong hotel

Shing Fui-On
Police Commissioner's guard

Lo Kin
Police Commissioner's guard
Sin Do-laai
Miss Sandra
Yeung Yau-Cheung
Greets Police Commissioner at the cafe