Transformers: Age of Extinction, the fourth installment of the Transformers movie franchise directed by Michael Bay, will be released June 27 2014. But on YouTube one can already access an immense trove of production footage recorded by amateurs in locations where the film was shot, such as Utah, Texas, Detroit, Chicago, Hong Kong and mainland China. Transformers: the Premake turns 355 YouTube videos into a critical investigation of the global big budget film industry, amateur video making, and the political economy of images.