A 'Number' by the numbers

“I Am Number Four”? I am not impressed. And you won’t be either unless, maybe, you’re in high school. That’s both the primary setting and the level of sophistication of this hybrid teen romance and sci-fi thriller, which aspires to take advantage of a genre mix made popular by the “Twilight” phenomenon. This wannabe has lavish production values, considering that it is a B-movie with a cast most adults have never heard of by name. The spectacle is elaborate, with its unknown hottie headliner (Alex Pettyfer) defying laws of physics and eluding scary killer aliens. So it comes as no surprise that the successful Michael Bay is producing.