When did the second season of the series which has the first titled "It Came from the Nightosphere" premiered? 
It Came from the Nightosphere: "It Came from the Nightosphere" is the first episode of the second season of the American animated television series "Adventure Time". Adventure Time (season 2): The second season of "Adventure Time", an American animated television series created by Pendleton Ward, premiered on Cartoon Network on October 11, 2010 and concluded on May 2, 2011.
October 11, 2010