Dr. Marshall Swinson ran this hospital before "Dr. Algernon J. Rottwell" / "Dr. Rot" (Bentley Newton) took over. Rottwell's insanity infected the whole place and he eventually sparked a riot, which lead to him taking over as the head of the Dunwich Sanitorium. Wolverine eventually fell into his trap, and escaped but with painful wounds.
- Patient X (Logan): mutant with a haunted past
- Charlie Chainsaws: killed people with a chainsaw, and stacked them behind his cabin like kindling
- The Biter: a cannibal that had to wear a helmet to prevent him from trying to eat anybody
- The Widow: never talks because she bit off her own tongue and the Biter was the one to perform the Heimlich on her.
- The Dwarves: nobody knows what they did, but they always speak their crimes in riddles
- Many others, unnamed
- "Dr. Algernon J. Rottwell" (Bentley Newton)
- The Dunwich Sanatorium is possibly a reference to Dunwich, a town in Massachusetts created by H.P. Lovecraft in The Dunwich Horror (1929), and to the Arkham Asylum, a DC Universe location whose name comes from Arkham, another city created by Lovecraft and a central location in in stories.
- The alias of Bentley Newton, "Dr. Algernon J. Rottwell" is possibly a reference to either or both of two authors whose works may have inspired elements of the Dunwich Horror short story:
- Algernon Blackwood, another famous horror author included by Lovecraft as one of the "Modern Masters" in the section of that name in "Supernatural Horror in Literature", and his works were alluded to or influenced Cthulhu Mythos authors including Lovecraft, Frank Belknap Long, Clark Ashton Smith and Ramsey Campbell. It is stated that the track of Wilbur's brother in the Dunwich Horror recall those seen in Blackwood story "The Wendigo".
- Algernon Charles Swinburne, which wrote "By the North Sea", a poem about the lost port of Dunwich, Suffolk, England. That poem was in an anthology owned by Lovecraft.
- 5 Appearances of Dunwich Sanitorium
- Minor Appearances of Dunwich Sanitorium
- Media Dunwich Sanitorium was Mentioned in
- 1 Images featuring Dunwich Sanitorium
- Location Gallery: Dunwich Sanitorium