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Astronauts fly to moon and find hostile ancient alien race, i think 1980s

Can you identify this poorly remembered movie from my youth? The plot, as I remember it:
Humans find an ancient alien ship in orbit.  (i remember a scene where an alien body drifted into shot behind the astronaut and scared the crap out of me) They recommission the Apollo programme to go the moon to explore (for some reason I remember the rocket being Saturn 5). At the moon, they encounter the remnants of the ancient civilisation who are hostile to them. I can't exactly remember much of the rest of the plot. I do remember a scene where a robot with a buzz saw arm was about to torture one of the protagonists and there was some sort of scene involving violent decompression.

I watched it on VHS as a child, late 80s or early 90s. It couldn't be older than late seventies, B movie without any major stars that I recognized at the time.
asked Jul 16, 2013 in Name That Movie by Greatbear (1 point)

1 Answer

"Moontrap" (1989)
starring Walter Koenig (Chekov of "Star Trek"), Bruce Campbell (an iconic star with a major cult following)
From IMDb:
During a routine flight, two veteran space shuttle pilots discover an alien artifact and bring it back to Earth. It soon turns out to be an extraterrestrial war robot that is able to recycle any biological or technical material for its own deadly use. The two astronauts are sent to the moon, where NASA expects to uncover the mystery of the alien robot's origin. They discover an ancient humanoid culture and battle the ultimate threat of the war machines heading toward Earth.

http://www.imdb.com/title/tt0097911/

You can watch the movie here:
http://www.youtube.com/watch?v=xVZjzv1uDlg
answered Jul 16, 2013 by MystMoonstruck (10,229 points)
I agree, this is "Moontrap".
Full movie is here on Youtube:
https://www.youtube.com/watch?v=1ciDXmZLHsk
At ca. 1:12:07 you can see the robot with the buzzsaw arm.
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