In Season 3 of Penny Dreadful, Vanessa Ives (Eva Green) accepting her demons could exact a terrible cost and plunge the world into darkness, while Ethan Chandler (Josh Hartnett), Dr. Frankenstein (Harry Treadaway), Dorian Gray (Reeve Carney), Sir Malcolm (Timothy Dalton), the Creature, and Lily (Billie Piper) must each face their own monstrous selves.