An adaptation of the first of a proposed six-book series about an extraterrestrial prodigy hiding out on Earth from would-be rival alien killers, I Am Number Four is a technically polished but rather unexceptional thriller that never much sets its sights beyond satisfying the lowest-common-denominator expectations of its target teen demographic. Broken down to its component parts, it’s difficult to not look a bit cynically upon the film, since it feels a bit like an emo-action valentine mash-up of carefully cross-tabbed teen movie trends. For the full, original review, from Screen International, click here. (Disney/DreamWorks, PG-13, 109 minutes)