Just youtube it.
Adventure Time (formerly known as Adventure Time with Finn & Jake) is an American animated television series created by Pendleton Ward. It is based on the animated short "Adventure Time" that aired as part of Frederator Studios' Random! Cartoons on Nickelodeon. The series focuses on the surreal adventures undertaken by two best friends: Finn (a 12-year old boy) and Jake (a wise 28-year-old dog with magical powers) that dwell in the Land of Ooo. In September 2008, the short was officially greenlighted for a series by Cartoon Network. Half-episode "sneak peeks" aired on March 11 and 18, 2010, and the series officially premiered on April 5, 2010.