Last night Nickelodeon aired the finale of the animated spin-off series The Legend of Korra, bringing a nine-year journey that started with Avatar: The Last Airbender to a close. But perhaps “aired” is the wrong word. Because, in an unprecedented move, Nickelodeon pulled The Legend of Korra off TV earlier this year and screened almost the entire last two seasons online only. That’s right, something called The Legend of Korra, an adventure show about teenagers with the supernatural ability to manipulate the elements, pushed the envelope so far it got yanked from TV. And last night, during the finale, creators Bryan Konietzko and Michael Dante DiMartino shoved that envelope even further. And they shoved it hard. Kids TV may never be the same again.