A Chinese immigrant, recently arrived in America, travels to Texas looking for honest work. However, all he encounters is racism. He soon impinges on the interests of a slave trader called Spencer, ending up with a price on his head. "Shanghai Joe" uses his martial arts expertise to free the Mexican slaves from their cruel master, but then Spencer and his friends decide to hire the four most terrifying bounty hunters of the West, among them a cannibal and a scalp hunter.