Nickelodeon's new fantasy cartoon series "The Legend of Korra" hits TV screens starting on April 14, and Speakeasy has an advance look. The new show is a sequel to the acclaimed series "Avatar: The Last Airbender," but takes place 70 years later. "Avatar" is set in a world in which some supernatural benders can magically manipulate air, earth, water and fire--but only the Avatar can control them all. The new series focuses on the adventures of a female Avatar named Korra. We're not going to give away plot points, but the world has changed in the new series--there are cars, radio and organized crime gangs. During the...