The second episode of "The Legend of Korra: Book Four" might have raised an "Avatar" fan’s eyebrow upon hearing its title. "Korra Alone," a callback to the episode "Zuko Alone" from the original "Avatar:...

“Legend of Korra,” the sequel series to the original “Avatar: The Last Airbender,” is back. After “Legend of Korra: Book Three” ended a couple of months ago, “Legend of Korra: Book Four,...