What was the name of an animated American television series which is set in a post-apocalyptic world, with an episode named Reign of Gunters?
Adventure Time (season 4): The fourth season of "Adventure Time", an American animated television series created by Pendleton Ward, premiered on Cartoon Network on April 2, 2012 and concluded on October 22, 2012. Adventure Time (season 4):  The season follows the adventures of Finn, a human boy, and his best friend and adoptive brother Jake, a dog with magical powers to change shape and size at will.
i don't know