Thirty-something slacker Shaun (Simon Pegg) has no clue what to do with his life or with his relationship with his girlfriend, Liz (Kate Ashfield). But motivation comes in the form of a freak zombie attack that has once-ordinary citizens terrorizing the streets of London. With support from his well-meaning best mate (Nick Frost), Shaun acts quickly to save Liz and his mother (Penelope Wilton) from danger. But is it simply too late for heroics?