Platinum’s vampire comicbook series “Blood Nation” is set for the feature treatment from Alexandra Milchan’s Emjag Prods. and Platinum Studios. Set in the not-too-distant-future, “Blood Nation” tells the story of a country overrun by vampires and walled off from the rest of the world. Decades later, rumors that these creatures have found a way to escape their isolation force a small group of humans to pierce into the heart of the nation on a mission to save humanity.Milchan will produce with Platinum Studios’ chairman and CEO Scott Mitchell Rosenberg. Randy Greenberg of The Greenberg Group, who helped negotiate the deal, will exec produce. “‘Blood Nation’ is a world war movie set in the future where the humans and the vampires have divided up the planet but not yet made peace with each other,” said Milchan. Platinum, which has a library of more than 5,000 titles, is de veloping Cowboys and Aliens” with Steven Spielberg, Ron Howard, Brian Grazer, DreamWorks, Universal, Imagine and Kurtzman/Orci. The banner’s in post-production on “Dylan Dog: Dead of Night” with Hyde Park and Omnilab and also is developing “Unique,” “The Witchblade,” “Atlantis Rising” and “The Weapon.” Milchan, a principal at New Regency, is president and CEO of Emjag and was a producer on “Mirrors” for Fox and “Righteous Kill” for Overture. She’s developing Alexandre Aja’s “The Contractors” with Gaumont, “Headshot” with Alfred Gough and Miles Millar, “The Wolf of Wall Street” with Leonardo DiCaprio’s Appian Way and “Men Under” with Scott Rudin.