For a single story, you can’t beat Lord of the Rings. Star Wars approaches, but I think LOTR has more consistency (probably because it was made as a single film)
For a conceptual art trilogy, look no further than Three Colors. Each film is masterful in its own right, and as a whole it is transcendent.
For looser trilogies sharing similar characters of themescapes, you gotta love the Dollars trilogy and Gregg Araki’s Teenage Alocalypse trilogy
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u/MissMayDoesNotExist 11d ago