20. 'Attack the Block'

In a year with a lot of mediocre-to-downright-awful "Earth vs. aliens" movies, it may seem like the concept is on its last legs. But fear not, because 'Attack the Block' has come along and flipped the sci-fi genre on its head. In 'Block,' inner-city youth delinquents from London head out for another night of criminal behavior, only to stumble upon an invasion from some freaky fang-bearing aliens. It's left up to these anything-but-heroes to save their neighborhood (and the world). 'Attack the Block' works so well because its young cast gets to live out every teenage boy’s bad-ass action hero fantasy; even when they’re running for their lives and fighting off blood-thirsty monsters with samurai swords, you’ll be jealous at how much fun they’re having. -- E.L.