From Back to the Future to Tenet and Interstellar, cinema has portrayed time travel in many imaginative ways. Kristie Miller is the joint director of the interdisciplinary Centre for Time at the University of Sydney, and her research focuses on the nature of time and our relationship with it. For her, movies such as these can explore complex ideas around the metaphysics of time. These are five of her favourites. But be warned, discussing them properly means there are some spoilers!