28 Days Later is a horror film directed by Danny Boyle and starring Cillian Murphy. The film is set in a post-apocalyptic world where a zombie infection has spread across the globe. With a runtime of 28 days, the movie follows a group of survivors as they navigate the dangerous and infected world, trying to survive and find safety. The UMD video film for Sony PSP allows viewers to experience this intense and thrilling horror film on the go, making it a must-have for fans of the genre.