My local cinema did a short series of Japanese classics recently. One of them was the original “Godzilla” (aka “Godzilla: King of the Monsters!”) film, actually called “Gojira”. When it came to the west, it was edited and altered and Raymond Burr was added in.
The original film is worth digging out, if you can. It’s a little crude by modern standards, but there’s an interesting story. Remember that the war had been over maybe ten years, a little longer, so was still fresh in people’s minds.
Oh, and avoid all the re-makes and spin offs.
Another Japanese film from the 1950s is “Seven Samurai”. It’s the answer to a classic quiz question, which film was remade as “The Magnificent Seven”. But the original is worth a watch. It’s long, but fascinating.