The Host (****)
Aliens on earth
Humanity is hiding
Free will reigns supreme
POSSIBLE SPOILERS AHEAD: I read the book version of The Host back in 2008 soon after it was first released (in no small part because of my Twilight-induced Stephenie Meyer love), and I enjoyed the book quite a lot. Although it features more than a few predictable plot twists and a love triangle—the love triangle isn't your typical YA one, and the interesting parts outweigh the predictable ones.
The movie version didn't disappoint. I obviously haven't read the book in a few years, so the story lines aren't completely fresh, but from what I remember, the movie covered them pretty well. If you haven't read the book, one of the main characters is actually two souls—one human, one alien—in one body. Translating the "voice in the head" bits could have come across on the big screen as really cheesy, but Saorise (which I only recently found out is pronounced SEER-sha; crazy Irish names) Ronan made it watchable. The girl has some serious skills when it comes to helping the audience feel what she's feeling as well; I definitely got choked up a few times.
The love triangle portion of the movie was a bit rushed, but the two guys involved—Max Irons as Jared and Jake Abel playing Ian—made it mostly believable. (I won't completely spoil the reason it was unusual.)
The best part of the film for me was the message. Director Andrew Niccol (who also directed one of my most favorite movies of all time, Gattaca) adapted the book for screen, and I think he did a great job of bringing out the interesting battle between the aliens and their human hosts. The idea of a parasitic alien race that takes over humanity relatively peacefully isn't brand new, but in The Host, human free will triumphs.