I recently wrote a thread about this movie.
It is an excellent film and I highly recommend it.
By the way, the guys do torture the alien but they don't kill it.
I thought the idea of strapping a welding mask over the alien's head was great.
Remember, don't make eye contact with them or else they can get into your head and control your mind.
And that wasn't a male actor in the alien suit...it was a woman.
Misty Rosas has played several creatures in different movies. She was Amy the Gorilla in
Congo.
http://www.imdb.com/title/tt0457275/Altered is on the Badmovies.org Myspace friends list too.