A group of Asian convicts are offered freedom by their American handlers if they can destroy a munitions dump in wartime vietnam. The mission is officially scrubbed just as the convicts are about to parachute into the Vietnamese jungle, but by then it's too late to turn back.

A soldier visits the grave of Invincible Asia (from Part II) and finds she is alive after all. He informs her that numerous Asia the Invincible inmposters, including her former lover, Snow, are causing havoc in her name. Soon the real Asia is on a campaign to reclaim control of the world, with a Japanese submarine and a Spanish warship at her disposal.

Martin (Michael Wong) is a professional thief. He brings his three new assistants Walt, Casper, and Janice to see Karloff and his men at Castle Hill. Martin offers to steal the Czar's Prism, the largest diamond in the Republic from the Museum. In order to strengthen his power, he invites Mandy (Shannon Lee) to work with him...

Sammo plays pig farmer Wong Lung, a Bruce Lee fanatic who arrives in Hong Kong from the territories to work in his cousin's cafe, and just like Bruce Lee has a run in with a local gang. When the cafe is destroyed Wong Lung finds a job in a local Dim Sum bar and befriends two of the waitresses.

After a nuclear explosion devestates the city, the three heroines from Part I must reunite to defeat an evil capitalist who controls all the fresh drinking water, and a mad general who wants to take over the government.