Is he going to be Superhero or supervillain? Well, the choice has already been made.  Dwayne "The Rock" Johnson says he's going the anti-hero route for his role in the upcoming Shazam movie, calling it an honor to become Black Adam.  After months of speculation as to whether or not he would play the DC Comics hero or his nemesis, Johnson tweeted the news this week with the dramatic introduction, "Kneel at his feet or get crushed by his boot."  Coming off the title role in the Brett Ratner-directed  "Hercules," Johnson is also attached to produce the Shazam movie for New Line.  The studio also confirmed that Johnson would play Black Adam on screen.