If the first 15 minutes don’t send you running for the exit, Disney’s I Am Number Four turns out to be a decent science fiction thriller. It’s strictly boy meets girl, and the story is derivative of movies you’ve seen before, but the lead actors are fine, tension builds and action makes sense. The bad aliens are daunting and you find yourself rooting for the good guys, human and alien alike. The theme, played out with a tough girl, a feminine girl, a stone-faced hero and a geek with a mind of his own, involves empowering oneself through intelligent choices. Not more complicated than that, and not much better, either, but with amicable characters and good performances, the energetic vibe evokes The Terminator and the picture plays surprisingly well.