It's like a western Kaiju film
I saw this in a movie theater when it came out so it’s a bit nostalgic for me. It features Doug McClure and Peter Cushing ending up in the center of the Earth where humans are slaves to a bunch of bird people. The best way to enjoy the film is to look at it as something akin to a Japanese Kaiju film. It’s got a bunch of people in plastic suits being monsters. Some of them look a bit goofy but that was what they had at the time and they went all in on it.
The movie title "None," available on Prime Video, has received an average rating of 4.3 from 609 reviewers. 
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 {"Audio languages": ["English"], "Subtitles": ["English [CC]"], "Directors": ["Kevin Connor"], "Producers": ["Samuel Z. Arkoff", "Harry N. Blum", "John Dark", "Max Rosenberg", "Milton Subotsky"], "Studio": ["MGM Domestic Television"]}

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