night of the living dead started the idea of zomies taking over, dawn of the dead expanded on the idea of a widespread takeover, day of the dead expanded on the effect it would have on people, and land of the dead focused on the zombies themselves. dawn of the dead had this queer upbeat feel about it, as beefen said.

I was surprised how cheap the production felt and how high budget the story felt.

When there is no more room in the hell, the dead will walk the Earth. Awesome movie.