This was an excellent theater film. It was dark, scary, and had great visual effects and sound. Typically there isn't much of a storyline to horror films, but this one kept me interested, and had its share of twists and surprises. The acting was great, except maybe for Dennis Quaid, although I've never been a very big fan of his work to start with. But luckily the film didn't focus as much on his character as the others. And to top it all off, it has a really great happy ending. It keeps you on the edge of your seat, and makes you jump off a few times. I would probably go see it again in the theater if I wasn't currently unemployed. But I would definitely recommend it to anyone who likes suspenseful, gruesome sci fi films.