Hollywood’s recent penchant for interspecies teen romance is one of modern cinema’s most worrying trends. Twilight paired human with vampire, then human with werewolf (and if you haven’t read all the books, the next one is where it gets properly batshit). Now, I Am Number Four (which is blatantly pitched at the aforementioned films’ audience) unites human with alien. It’s an area of filmmaking that’s long been catered for – normally within seedy, unspoken of circles. Rarely – as is the case with Four - by Disney....