MINISERIES PREMIERE: The CW has imported this four-hour, two-night miniseries, which shifts in time between medieval and modern France, with hopes of satisfying viewers who are sad now that its period romance series Reign is gone for the summer. It’s hard enough to imagine anyone missing that silly series, and I don’t mean to Reign on CW’s parade, but Labyrinth is as unwatchable as it is impenetrable. Game of Thrones, it’s not. And even though it features John Hurt and Downton Abbey star Jessica Brown Findlay (as Lady Sybil Crawley), Labyrinth is a mess of Holy Grails, precious rings, Crusades, supernatural visitations, reincarnation and other ingredients, all thrown together in this adaptation, from Ridley Scott’s production company, of Kate Mosse’s novel. This is a warning, not a recommendation.