I saw a movie that was being used on MST3K several years ago (it was before they changed hosts) and all that I remember from the movie is that it had a girl with long dark hair (as a villain) that would constantly run around saying "yes, dark one". If I remember correctly, it was a group of people that were underground in some sort of cave.

I don't remember much else, but had wanted to see it again. I never caught it after that one time so I can't recall any more details. If anyone has a clue, please let me know!

Robot Holocaust (1986)

Thank you! I have been trying to figure out the name of this one for awhile now.