 The demented archaeologist Dr. Andrew Forbes (George Zucco) discovers a living, breathing serpent creature known to the Aztecs as Quetzalcoatl (the Killer Bird God) and accidentally kills his wife by giving her one of the beast s feathers, causing the creature to track her down and slaughter her. Now Dr. Forbes uses this twisted knowledge to extract revenge upon his enemies by placing one of the serpent s feathers on his intended victim and letting the beast loose to wreak havoc.