Cthulhu seems difficult to use in scenarios: not least because, according to Lovecraft's story, it takes a ship to kill him.
Which published scenarios feature Cthulhu prominently? I'm mainly interested in Call of Cthulhu scenarios. (I would be interested in Trail scenarios, but I'm fairly sure there aren't any, although correct me if I'm wrong.)
I'm definitely not interested in scenarios that use Cthulhu in a parodic way. For example, if there's a Paranoia adventure featuring a Cthulhu-like creature, I don't need to know.
Give me some details about how Cthulhu is used. Can he be killed? If so, how? Does he affect the Investigator's dreams? Tell me especially how the elements from the original story (sculpture, dreams, New Orleans swamps) make an appearance.
I'm also interested in any scenarios that use the white polypous thing in the lake, particularly if they have an explanation for what it is.