From publisher blurb: This release of The Manual of Mutants & Monsters provides game stats on Cthulhu, the most famous of the Great Old Ones. Includes game information on Cthulhu, as well as the Deep Ones race, including two stages of human/deep one hybrids. Rounding out this product are a number caper ideas for using Cthulhu in your game, a new advantage, and the Mental Disorder complication.