The following is a list of episodes for the anime series , which began airing in Japan on April 2, 2008. The series is currently licensed for release in North America by Konami. However, only 31 episodes from seasons 4 and 5 were dubbed into English by 4Kids Entertainment, due to low ratings, pressure to air Yu-Gi-Oh! Zexal, and an ongoing lawsuit from TV Tokyo and NAS.