In season 12, the series began producing and airing episodes in 1080i HD. However, until October 15, 2012 in the U.S., the episodes still aired in 4:3 aspect ratio, with the left and right sides cropped out. They have since begun airing in 16:9 in October 15, 2012. Season 12 also marks the switching of animation studios from "AKOM" to "ASHK". Starting with season 16, the series was produced by 9 Story Entertainment (now 9 Story Media Group) and airs in 16:9 aspect ratio. Along with this change, 9 Story produced a re-mastered opening theme for the series in 16:9, and animation was moved in-house using Adobe Flash. Season 19 was the last season to be produced by 9 Story, with Montreal based-Oasis Animation taking over starting in season 20. In November 2018, Bruce Dinsmore revealed that he has finished recording his final episodes in advance.