This textbook introduces the reader to modernist avant-garde theatre. It clearly explains the key terms as well as the major movements, including Expressionism, Dadaism, Futurism, Workers' theatres, Constructivism and the Living Newspaper, and Mass Performance, using a case study approach. It introduces the important innovations of the modernist avant-garde, reassesses theatrical techniques, and provides examples of plays and performances from across Europe and America. There are also chapters on The Modernist Body and on Interdisciplinary Performance. The book approaches the modernist avant-garde both as an area of academic study and as potential raw material for contemporary performance.