Viewer discretion is more than advised, it’s warranted. “Possession” lives up to its name giving us some of the darkest 59 minutes of television I’ve seen in a long while. It is not for the squeamish. “Possession” makes no apologies about the violence and vile behavior exhibited by the tortured Vanessa Ives (Eva Green) as she desperately battles against the dark forces trying to claim her for their own. “Possession” takes us on an arduous journey endured by Sir Malcolm Murray (Timothy Dalton), Sembene (Danny Sapani), Victor (Harry Treadaway), and Ethan (Josh Hartnett) as they do everything they can to help save Vanessa from both herself and the demons inside her.