There were horror movies before this trilogy, but nothing had come along quite like "Night of the Living Dead" upon its release in 1968.
The first film, which focuses on a small group of strangers riding out a zombie apocalypse in an abandoned cabin, is not just considered the first modern zombie movie — you're welcome, "Walking Dead" fans — but also one of the best horror films and one of the most influential movies of all time.
The next two follow-ups, also directed by Romero, an indie film legend, continued the series.
While there are more also directed by Romero, they came 20+ years after the third film in 1985, and aren't held in quite the same esteem.
"Night of the Living Dead" and "Day of the Dead" are available to stream across various platforms, while "Dawn of the Dead" is available to rent on Prime Video.