A group of camouflaged ninjas stealing a small case of plutonium from a transport vehicle in broad daylight in California. Back in his office in Sanzhi, Taiwan, The Colonel (Bo Svenson) receives word of the heist and the top suspect is the Sakura family. Selected for the job of locating this stolen nuke material is Mai Lin (Page Leong), an informant/dancer. Willi (Jay Roberts, Jr.), a drunken American playboy who is prone to playing the harmonica teams up with Mai Lin. Willi also just happens to be a white ninja.

Ring of Fire is about the immense natural force of the great circle of volcanoes and seismic activity that rings the Pacific Ocean and the varied people and cultures who coexist with them. Spectacular volcanic eruptions are featured, including Mount St. Helens, Navidad in Chile, Sakurajima in Japan, and Mount Merapi in Indonesia.