George R.R. Martin Says Three Other Game of Thrones Prequels Are in 'Active Development'

Last week’s news of Jane Goldman’s Game of Thrones prequel pilot may not be the end of HBO’s spinoff plans. Of course, we’ve known for some time that HBO was considering five possible prequels to continue, and expand, the Game of Thrones universe—but we still have no idea just how many will pan out. Goldman’s show…