From the introduction: "Welcome to Cathulhu (say cat-thoo-loo), an alternative setting which approaches Call of Cthulhu from a cat's-eye view! These additional rules connect the traditional Call of Cthulhu RPG with a feline milieu inspired by Akif Pirincci's Felidae and other novels." A sub-genre rule expansion for Call of Cthulhu. This is a set of rules for running cat characters in any of the three standard Call of Cthulhu settings. Originally published in German as part of the Cthuloide Welten magazines #1 and #2, this is the expanded English version printed in Worlds of Cthulhu magazine #4, including a cat character sheet.