Cult of the Cobra.

While stationed in Asia, six American G.I.'s witness the secret ritual of Lamians (worshipers of women who can change into serpents). When discovered by the cult, the High Lamian Priest vows that "the Cobra Goddess will avenge herself". Once back in the United States, a mysterious woman enters into their lives and accidents begin to happen. The shadow of a cobra is seen just before each death.