Nickelodeon has worked out a deal with Konami Digital Entertainment’s 4K Media to air several Yu-Gi-Oh! titles on it’s Nicktoons channel. The titles are: Yu-Gi-Oh! GX, Yu-Gi-Oh! 5D’s, and season 1 and 2 of Yu-Gi-Oh! Zexal.
http://www.animenewsnetwork.com/news/2013-04-25/nicktoons-adds-the-rest-of-yu-gi-oh