Spirits of the Air, Gremlins of the Clouds is a 1989 Australian independent post-apocalyptic sci-fi adventure film directed, produced and written by Alex Proyas, which was marking its first feature debut. Set in a post-apocalyptic world in which two siblings live in a homestead whose silence gets interrupted by a fugitive named Smith. Starring , and , the film was shot on location near Broken Hill, New South Wales and at Supreme Studios Sydney and was made with a budget of $500,000.