The English adaptation of the season began airing on on the Adult Swim programming block, and the last episode of the season aired on December 6, 2008.
The season initially ran from Januto Augin Japan on TV Tokyo. This season lasted twenty-eight episodes. This season, along with season five are fillers which are not direct adaptation of the Bleach manga by Tite Kubo the plot focuses on the introduction of the Bount, a race of humans that consume human souls to extend their lives, and their conflicts with Ichigo Kurosaki and his allies. The episodes are directed by Noriyuki Abe and produced by TV Tokyo, Dentsu, and Studio Pierrot. The fourth season of the Bleach anime series is named The Bount arc.
