On November 2nd, 1936, the world died. Finally, the stars had come right; and things that lurked under the seas for eons rose to claim their rightful place. Now, they rule the earth, stalking it like titans. Millions of women and men died—yet you survived, doomed to wander the ruins, searching for answers. What went wrong? Are there others like you? How can you stay alive? And is there a way to put this right? Cthulhu Apocalypse is a survival horror supplement for the Trail of Cthulhu roleplaying game that takes Investigators into a terrifying post-apocalyptic world. Using the award-winning Apocalypse Machine, GMs can destroy the world any number of ways-including the death rays of alien tripods, a plague of white flowers, or the rising of Great Old Ones-and run adventures of investigation and survival in a land transformed beyond recognition.