I've been trying to recollect what movie or (mini series) I watched in the 90s.
It may have been made before the 90s, I'm not sure.
In any case, it was about a man and his pre-teen daughter. They were on this planet and he had lost his wife. He lived the life of a scavenger, trying to bring back enough to keep them afloat.
One day he finds this strange green (I think) crystal and then his daughter is captured and taken to a space ship in lower orbit where they have other children and they're trying to perform some kind of operation on them. He rescues her and apparently has to go to some solar system, and then the movie, or episode ends and I've never seen the rest of it.
The space ship looked very much like a Nebulon-B2 frigate from Star Wars: