‘Supergirl’ Review: Even a Committed Milly Alcock isn’t Enough to Overcome This Mostly Tedious Superhero Movie by Casey Chong Forty-two years after the dismal 1984 version of Supergirl crash-landed both critically and financially, this all-new revisionist take on the Girl of Steel boasts Milly Alcock’s great performance, but the movie itself sputters.