Leviathan, also known as the God of Flesh, Hunger and Desire, is the overarching antagonist of the Hellraiser franchise. It is the "deity" residing inside the extra-dimensional world known as the Labyrinth who is the overlord ruling the Cenobites, including their masters Pinhead and the Engineer.
The Cenobites are fictional, extra-dimensional, and seemingly demonic beings who appear in the works of Clive Barker.