"Let me go and I'll kill it!"

[akiratubo]

I rented this movie on VHS in the late 90s.  It was a sci-fi/horror/actioner about a prison on a desolate planet (possibly asteroid).  It started with a new prisoner being brought in who was extremely dangerous.  He had a device either around his throat or his forehead (can't remember) to limit his power.  At some point during the movie, a monster got loose in the prison and killed everyone but one guard.  The super-prisoner told the guard to let him go and he would kill the monster.  She took the limiting device off of him, he hulk-ed out, and fought the monster.  Don't remember how the fight turned out or if anyone survived.

[Joe]

Alright, i'm not seriously suggesting this but im going to throw it out there anyway cause it sure as hell souds like it but i'm sure that it is not. "Pitch Black"

[akiratubo]

Definitely not Pitch Black.  I saw this movie before Pitch Black was ever released.  It would have been between '97-'99.

[RCMerchant]

Maybe the SURVIVOR (1998) aka TERMINAL FORCE II

http://www.imdb.com/title/tt0157079/combined