The third season of Adventure Time, an American animated television series created by Pendleton Ward, premiered on Cartoon Network on July 11, 2011, and concluded on February 13, 2012, and was produced by Frederator Studios and Cartoon Network Studios. 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. Finn and Jake live in the post-apocalyptic Land of Ooo, where they interact with the other main characters of the show: Princess Bubblegum, The Ice King, Marceline the Vampire Queen, Lumpy Space Princess, and BMO.

Adventure Time is an American fantasy animated television series created by Pendleton Ward and co-produced by Frederator Studios for Cartoon Network. The series follows the adventures of a boy named Finn and his best friend and adoptive brother Jake —a dog with the power to change size and shape at will. Finn and Jake live in the post-apocalyptic Land of Ooo, where they interact with Princess Bubblegum, the Ice King, Marceline, BMO, and others. The series is based on a 2007 short film that aired on Nicktoons. After the short became a viral hit on the Internet, Nickelodeon's executives passed on its option before Cartoon Network commissioned a full-length series from Fred Seibert and Ward, which was previewed on March 11, 2010. The same year, the series premiered on Cartoon Network on April 5, and it ended its eight-year run on September 3, 2018.