Romero's Dead series
Diary of the Dead (Romero, pre-production)

Each film is laden with social commentary ranging from racism to consumerism. The films are not produced as direct follow-ups from one another. The films' only continuation is the epidemic of the living dead. They are different stories telling how different people react to the same phenomonen. There are no real happy endings to the films as each takes places in a world that has gotten worse since the last time we saw it, the number of zombies ever increasing and the fate of the small amount of the remaining living always in the balance.

Night of the Living Dead
Since the release, critics and film historians have seen Night of the Living Dead as a subversive film that critiques 1960s American society, international Cold War politics, and domestic racism.

Dawn of the Dead
Dawn of the Dead received much critical acclaim for, among other things, the subtext involving American consumerism and materialism, as well as comments on news media and racism.

Day of the Dead
Romero once again presented the theme that people failing to work together was more dangerous than the actual threat of zombies. It was internal feuding and a failure to cooperate which led to the mutiny and total breach of the underground base. The casual viewer might not realize that the zombies posed very little direct threat. The antagonism between the characters is what destroyed the base
Although the story is bleak, Romero inserted some humour in Day of the Dead. When the military base is being overrun by zombies, there is a clown zombie and a nun zombie among the crowd.

Land of the Dead
The similarities between the fireworks mesmerizing the zombies and the shock and awe tactics applied during the 2003 Invasion of Iraq and the movie's distinction between the rich and poor, those that live in Fiddler's Green and those that live in the slums, something he considered Romero's take on the rising gap between rich and poor in America