Okay, here's the basic plot (without the twist-spoiler):
Place: The moon. Time: A future not long from now (2030-ish I think). Sam Bell, astronaut, is working on a lunar base of some sort. He is the only person on the entire base, only assisted by an all-knowing robot called GERTY (voiced by Kevin Spacey). He has been stationed on the base for almost 3 years, his contract nearing an end, and with his flight back to earth scheduled only 14 days away, he can't wait to get back home to see his wife and daughter again. However, suddenly one of the automated moon-vehicles (harvesting rock-samples or whatever) goes awry, and he goes outside of the base to investigate it... but then something unexpected happens, and he has to change his perspective on everything.
- End of basic plot summary.
Bell is played by the brilliant Sam Rockwell, whom you probably know from "Charlie's Angels", "The Green Mile", "Confessions of a Dangerous Mind", "Matchstick Men" or the equally brilliant sci-fi movies "Hitchhikers Guide to the Galaxy" and "Galaxy Quest". This is probably his biggest part in a movie EVER, and I doubt if he will ever get a role as big as this again (not because he's not capable or worthy of it, but because it was a HUGE performance). If you're a fan of Rockwell (or perhaps of Kevin Spacey's voice),then you will not be disappointed, as they're both great in "Moon".
For sci-fi lovers, this movie is really a blast. It takes some inspiration from such classics like "2001: A Space Odyssey", "Outland", "Silent Running", "Alien", and others, but still manages to be unique and original, something which has become increasingly rare in the recent big-budget/massive special effects/quick fix-tradition of Hollywood nowadays. "Moon" achieved something great for a budget of approximately 5 million dollars, which is ridiculously low by regular movie-standards, where a feature film usually would cost ten times that amount.
As for the theme of the movie, the subjects of alienation, solitude, dehumanization and disbelief are risen (among others),which often leads to some of the best movies (in my opinion),as is the case here too.
All in all, this movie definitely ranks among my personal top-20 all-time sci-fi favorites, and I will presume it will be placed equally high on most sci-fi aficionado's lists. An excellent debut directorial by Duncan Jones, and clearly one of the 5 best sci-fi movies made in the last 10 years. Already looking forward to his next feature film, which allegedly is also going to be a sci-fi movie (although with a much bigger budget).
Final rating: 9.5/10 - a nearly flawless movie.