Here's the trailer...
Don't remember it?
Unless you happen to have a vhs cassette of it, or a copy of the comic book adaptation (which we're currently re-presenting at our "brother" blog, Secret Sanctum of Captain Video™) you probably never even saw it!
It's not currently available on Region 1 DVD/BluRay, so the only way you're going to see it is on a DVD-R/used VHS/comic book.
Which is a shame, because, despite the B-movie budget, it's a real hoot!
The pre-CGI effects are pretty well done, and both script and acting are well above the typical SyFy Saturday night crap.
Well worth the effort of tracking down.
or have a look at these MoonTrap collectibles from Amazon...