Sometimes small groups of people have to face monsters on their own, outside of normal society.
Sometimes a group with a reasonable number of people get injured and nibbled down to a small group.
In the Land Unknown, a US Navy team enters a volcano and gets trapped with their helicopter.
Sometimes people are transported by submarine or aircraft to a place where dinosaurs still exist.
Othertimes, they are sent through time to deal with a world that is not their own. I have all these movies on video and have seen them many times. They are all great in their own way.
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