I was a wee lad when I saw it 30 years ago. This is what I can remember. The film is focused on an underground research center where they travel to other dimensions. Something comes back with them on one trip and people start getting killed off. I can't remember much else, except that it also involved at least one woman in a stasis/cryo chamber and in the end, the monster kills a scientist lady with a pipe through the gut and says something like, he'll take this one back, just before going to its dimension.
The protagonist and the cryo lady are then left in the research facility and the movie ends.