The series was inspired by the fantasy role-playing game Dungeons & Dragons and video games. It is produced using hand-drawn animation; episodes are created through the process of storyboarding. Multiple episodes are worked on concurrently with each individual episode taking roughly eight to nine months to complete. The Adventure Time cast record their lines in group recordings and the series regularly employs guest actors for minor and recurring characters. Each Adventure Time episode runs for about eleven minutes; pairs of episodes are often telecast to fill half-hour program slots. Six seasons of the program have been completed, the seventh is currently airing, and the show has been renewed for an eighth season, which is scheduled to air in the latter part of 2016.[4] As of October 2015, a feature-length film is in development.