Astronomers theorize that our sun is not alone in its journey around the galaxy, but is accompanied by a heretofore unknown second star of dim radiance. This second star, while perhaps invisible from Earth even with the finest optics, periodically passes close enough to our solar system to have far-reaching effects upon the evolution of our planet - in the past causing mass extinctions, climactic changes, and similar catastrophes. Spawn Of Azathoth is a campaign for the Call of Cthulhu horror role-playing game. Through the appearance of ghostly apparitions, the exploration of sunken treasure, and journeys to unimaginably far-off lands the investigators find themselves entwined in cosmic events.