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: Developed by head writer Kent Osborne , showrunner Adam Muto , Jack Pendarvis , and Julia Pott .
: Finn is approximately 16 or 17 years old during this season, reflecting the show's real-time aging of its protagonist. Adventure Time - Season 9
: Sandra Lee served as the art director for this arc, which featured guest animation and specialized background designs by former lead designer Ghostshrimp . Narrative & Character Development : Developed by head writer Kent Osborne ,
: It explored a dystopian Land of Ooo transformed by extreme elemental magic, forcing Finn and Jake to team up with the Ice King, Betty, and Lumpy Space Princess. showrunner Adam Muto