Research and pedagogical interest in Grand-Guignol and popular horror performance at the University of South Wales has led to the commissioned creation of an annual public Halloween event for a council in Wales. In 2015, the event took place at a Nature Reserve with the theme of ‘Werewolves’. This article gives an account of this Practice-as-Research project, in which a large ensemble developed skills in various areas: writers investigated the lycanthropic folklore and culture of Wales and beyond; performers trained in storytelling and physical performance; and a technical and stage management team facilitated the overall experience. This article gives a detailed account of the cultural context, creative process and final production of the 2015 ‘Werewolves’ event. In so doing, it demonstrates how an ensemble working intensively on a focused project with a willing audience can present an example of a negotiated horror world through which the seeming oxymoron of a ‘brand new ancient legend’ can be inaugurated.