Produced through market relations of neoliberal managerialism, teacher subjectivities are becoming progressively commodified. With the increasing casualisation of the teaching workforce, the well-being and status of casual relief teachers (CRTs) can be seen as an area of concern, at risk of 'flexploitation'. More than just a convenient labour pool, CRTs operate on the margins of school communities, a space fraught with a range of issues. In many instances, CRTs experience less job satisfaction; less rapport with students and colleagues and less access to school information, professional development, resources and teaching materials. This article draws on a positioning theory to frame the discursive production of CRT selves within the neoliberal milieu. It offers a detailed analysis of collective biographies that explore narrative formations of casual teaching. Schooling discourse is replete with metaphorical language that frames teacher positioning, and a range of existing metaphors in CRT literature highlight their vulnerability in particular. Rather than offering an analysis that addresses casual teacher performance as a problem to be solved, this article proposes that the relationship between 'structural marginalisation and the 'othering' that CRTs can experience is associated with the politics of market-related performativity.