Al Mundy matches wits with a mad scientist aboard a plane to a scientific meeting in Melbourne. Alexander Mundy is assigned to guard Professor Howard Moses, one of several scuemtists summoned to a meeting in Melbourne and slated to die en route. The passengers aboard the plane are advised, via the movie projector, that the scientists must die because they have polluted the earth. Eight meet death and Moses is designated the next victim as Al and stewardess Ellen Porter search for the sudden death machine.