In case you haven't been paying attention and want to know what the monster Demeking looks like, well, he's a sort of undersea/space Gastropod -- a snail-like monstrosity with eyes on stalks and what looks a bit like coral vents on his back.In 1969, a young man finds an anonymous letter in a glass bottle which describes the apocalyptic arrival of a cosmic monster known as Demeking. Since then, he has physically prepared himself in a lone struggle for that fateful day when the monster will arrive.
Here he is from a distance and direct from the movie:
Here are models of him -- puppets used as part of the SFX collateral:
Finally, a Demeking toy:
Information on Demeking from Undead Backbrain and Undead Brainspasm: