Five friends who reunite in an attempt to top their epic pub crawl from 20 years earlier unwittingly become humankind's only hope for survival.

Shaun lives a supremely uneventful life, which revolves around his girlfriend, his mother, and, above all, his local pub. This gentle routine is threatened when the dead return to life and make strenuous attempts to snack on ordinary Londoners.

An illustrious British boarding school becomes a bloody battleground when a mysterious sinkhole appears at a nearby fracking site unleashing unspeakable horror.