List of episodes/Season 9

Season 9 episodes were originally ordered as part of the series' eighth season, which would make "Three Buckets" envisioned as the eighth-season finale. Under the new order, "Orb" through "Three Buckets" were then considered by Cartoon network to constitute the series' ninth season. The season also features the third and the last miniseries of Adventure Time, Elements, aired on April 24, 2017 as part of the season. It was first announced on March 31, 2017, by Cartoon Network during the unveiling of their 2017–18 program lineup.