Lisa Johnson Mandell's Supergirl review admits that the movie is a bit messy and dark, but it's also exciting, refreshing and moving, mostly thanks to the presence of fluffy sidekick Krypto. You know the plot of most superhero movies before you see the trailer, read the review or walk into the theater: big scary bad person/robot/alien threatens to destroy the city/world/universe, and only one super powered being, or a team...