Night of the Living Dead (1968)

Story:
Many years ago in the quiet Pennsylvania countryside, the dead began to walk. Fuelled for an insatiable hunger for human flesh, the ghouls ghastly quest inadvertently brought together six strangers whose inability to unite would ultimately lead to their tragic downfall.
Source: IMDB

George A. Romero’s debut set the template for the zombie film, and features tight editing, realistic gore, and a sly political undercurrent.
Rotten Tomatoes Critics Consensus

Night of the Living Dead (1968) is part of the franchise: George A. Romero’s Living Dead Franchise
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Major accolades received by Night of the Living Dead (1968)

Included among the 1001 Movies You Must See Before You Die.
Selected for preservation in the United States National Film Registry by the Library of Congress as being “culturally, historically, or aesthetically significant”.