Shaun (Simon Pegg) is an English bloke who spends his time hanging out in the local pub and playing video games with his friends. He has lost his girlfriend, messed up his relationship with his mom, and is stuck in a bad job. When a 28-days-later type zombie epidemic invades his town, he leads a group of people in a trek to safety from their homes to the pub, while trying to fix his relationship problems along the way. When he gets to the pub they find it infested with zombies, and must use their ingenuity and video game honed skills to save the day.