80s kids movie takes place on another planet

I know this movie was on tv in the 80s in English I don’t remember much but I do remember thinking it was about a child and I think his parents were killed.  I think it was a car accident or actually possibly was a spacecraft crash I believe it’s possible it took place in the future and then I remember there being something about a giant and a dark cave or possibly even a suspended cage in the air in his cave.

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