Intermediality: the incorporation of digital technology into theatre practice, and the presence of film, television and digital media in contemporary theatre is a significant feature of twentieth-century performance. Presented here for the first time is a major collection of essays, written by the Theatre and Intermediality Research Group of the International Federation for Theatre Research, which assesses intermediality in theatre and performance. The book draws on the history of ideas to present a concept of intermediality as an integration of thoughts and medial processes, and it locates intermediality at the inter-sections situated in-between the performers, the observers and the confluence of media, medial spaces and art forms involved in performance at a particular moment in time. Referencing examples from contemporary theatre, cinema, television, opera, dance and puppet theatre, the book puts forward a thesis that the intermedial is a space where the boundaries soften and we are in-between and within a mixing of space, media and realities, with theatre providing the staging space for intermediality. The book places theatre and performance at the heart of the 'new media' debate and will be of keen interest to students, with clear relevance to undergraduates and post-graduates in Theatre Studies and Film and Media Studies, as well as the theatre research community.