As the Christmas week movies continue to roll out on DVD and Blu-ray this spring, you’re left with plenty of holiday-themed choices after Easter, like the weepy Extremely Loud and Incredibly Close and the equally rapey The Girl with the Dragon Tattoo and In the Land of Blood and Honey. Why not consider some invisible killer aliens to go in with the mix. Telling the story of random survivors on the streets of Moscow after a violent interstellar invasion, The Darkest Hour gives the world hope… if your definition of hope is a dancing at a killer club scene with Speed Racer before blindly battling electric aliens. While vodka might be the obvious choice, you might want something a little more light, especially if you opt for the at-home 3D version of the film. Focus might become a problem.