In rental stores, I Am Number Four debuted at No. 1 on Home Media Magazine’s weekly rental chart, with The Mechanic slipping to No. 2 and Gnomeo & Juliet bowing at No. 3.

The first trailer for I Am Number Four has just made it online, and if director DJ Caruso set out to make a movie that looks like a mix of Twilight, Blade and every generic teen superhero movie ...