I was a young kid watching an inappropriate alien movie sometime in the early 90’s.  The only thing I remember is that there is a black guy on a bulldozer like thing underground.  He was a good guy helping the protagonist and then all of a sudden reveals himself to be an alien. I think he turned orange with tentacles.  It may not have been a very scary movie, but it frightened me and I still have nightmares about it.  Being able to re-watch it as an adult may help me get over it.

Thanks