The idyllic South Seas setting of Horn Island is shattered when 18 soldiers are killed during a test of the novel chemical weapon "Elvis." The only survivors of the catastrophe are the scientist and inventor of the deadly substance, Dr. Long, and the officer in charge, Major Brynner. Ten years later, when Long is critically wounded by the still-vengeful Brynner, he confides his secret to the young Tim. The attempt to transport the lethal cargo to the safety of Fort Magruder becomes the funniest and most action-packed chase ever seen under the blazing Montana sun...