Gary King (Simon Pegg), who is overly addicted to alcohol and in his forties, suddenly remembered a proud but unfinished debauchery in his youth 20 years ago, so he successively found good partners Oliver Chamberlain (Martin Freeman), Peter Page (Eddie Marsan), Steven Prince (Paddy Considine) and Andy Knightley (Nick Frost), who now have their own families and careers. They met and returned to their hometown of Newton Haven, trying to find the happy time of 5 people, 12 bars and 60 glasses of beer all night. The town is the same as always, with almost no changes, but the people in the town seem to have forgotten these old boys at all. Under Gary's leadership, everything was relatively normal at first, but when night fell, strange events took place alternately, and Gary and others found that they seemed to have unknowingly stepped into some kind of supernatural trap...