Robert Rodriguez is a busy fellow these days. Hot on the heels of the announcement last week that he’ll be adapting Frank Miller’s graphic novel Sin City for the big screen comes word that he’s also signed on to A Princess of Mars. Variety reports that the project, a version of author Edgar Rice Burroughs’ first novel, is expected to be a big-budget flick ($100 million) thanks to CGI, with the Lord of the Rings series mentioned as a parallel. Paramount Pictures is hoping to develop it into a franchise.