 In George R. R. Martin's series of epic fantasy novels, "A Song of Ice and Fire", and the series' television adaptation, "Game of Thrones", Wargs are skinchangers who can enter the mind of an animal (and in Bran Stark's case with Hodor, a person), see what they are seeing, and control their actions.Talented skinchangers can become greenseers, who can glimpse into the past, present, and future.An adage says that one man in a thousand is a skinchanger, and one skinchanger in a thousand is a greenseer.