"Unspeakable: Beyond The Wall of Sleep" follows a renowned oneirologist, Dr. Ambrose London, who is called to Arkham Asylum to examine a patient named James Fhelleps, seemingly possessed by the personality of Joe Slater, a long-vanished, primitive man from the Catskill Mountains. As Ambrose investigates further, using his "Dream Machine" to delve into Fhelleps' dreams, he unwittingly releases a terrifying alien entity with the potential to destroy the world.  Key points about the plot: Based on a Lovecraft story: The narrative is adapted from H.P. Lovecraft's short story "Beyond the Wall of Sleep," which explores the unsettling nature of dreams and the potential for otherworldly forces to seep into our minds.